..

QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveFileListView.xaml.cs

@@ -15,9 +15,16 @@ namespace QuickLook.Plugin.ArchiveViewer
 
         public void Dispose()
         {
+            GC.SuppressFinalize(this);
+
             IconManager.ClearCache();
         }
 
+        ~ArchiveFileListView()
+        {
+            Dispose();
+        }
+
         public void SetDataContext(object context)
         {
             treeGrid.DataContext = context;

QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/ArchiveInfoPanel.xaml.cs

@@ -28,9 +28,16 @@ namespace QuickLook.Plugin.ArchiveViewer
 
         public void Dispose()
         {
+            GC.SuppressFinalize(this);
+
             fileListView.Dispose();
         }
 
+        ~ArchiveInfoPanel()
+        {
+            Dispose();
+        }
+
         private void LoadArchive(string path)
         {
             LoadItemsFromArchive(path);

QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Plugin.cs

@@ -16,10 +16,9 @@ namespace QuickLook.Plugin.ArchiveViewer
             if (Directory.Exists(path))
                 return false;
 
-            SevenZipExtractor archive = null;
             try
             {
-                using (archive = new SevenZipExtractor(path))
+                using (var archive = new SevenZipExtractor(path))
                 {
                     // dummy access to the data. If it throws exception, return false
                     if (archive.ArchiveFileData == null)
@@ -42,10 +41,6 @@ namespace QuickLook.Plugin.ArchiveViewer
             {
                 return false;
             }
-            finally
-            {
-                archive?.Dispose();
-            }
 
             return true;
         }
@@ -63,9 +58,16 @@ namespace QuickLook.Plugin.ArchiveViewer
             container.Title = $"{Path.GetFileName(path)}";
         }
 
-        public void Close()
+        public void Dispose()
         {
-            _panel.Dispose();
+            GC.SuppressFinalize(this);
+
+            _panel?.Dispose();
+        }
+
+        ~Plugin()
+        {
+            Dispose();
         }
     }
 }

QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/QuickLook.Plugin.ArchiveViewer.csproj

@@ -36,6 +36,7 @@
     <Reference Include="PresentationFramework" />
     <Reference Include="SevenZipSharp">
       <HintPath>References\SevenZipSharp.dll</HintPath>
+      <EmbedInteropTypes>False</EmbedInteropTypes>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs

@@ -48,7 +48,7 @@ namespace QuickLook.Plugin.ImageViewer
             container.Title = $"{Path.GetFileName(path)} ({_imageSize.Width} × {_imageSize.Height})";
         }
 
-        public void Close()
+        public void Dispose()
         {
         }
     }

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/QuickLook.Plugin.ImageViewer.csproj

@@ -45,7 +45,7 @@
     <Reference Include="System.Xml" />
     <Reference Include="WindowsBase" />
     <Reference Include="WpfAnimatedGif, Version=1.4.14.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\WpfAnimatedGif.1.4.14\lib\net\WpfAnimatedGif.dll</HintPath>
+      <HintPath>..\..\packages\WpfAnimatedGif.1.4.14\lib\net\WpfAnimatedGif.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/OfficeInteropWrapper.cs

@@ -0,0 +1,181 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using Microsoft.Office.Interop.Excel;
+using Microsoft.Office.Interop.PowerPoint;
+using Microsoft.Office.Interop.Word;
+using Application = Microsoft.Office.Interop.Excel.Application;
+using Task = System.Threading.Tasks.Task;
+
+namespace QuickLook.Plugin.OfficeViewer
+{
+    internal class OfficeInteropWrapper : IDisposable
+    {
+        public enum FileTypeEnum
+        {
+            Word,
+            Excel,
+            PowerPoint
+        }
+
+        private readonly string _path;
+        private readonly string _tempPdf = Path.GetTempFileName();
+
+        private Application _excelApp;
+        private Microsoft.Office.Interop.PowerPoint.Application _powerpointApp;
+        private Microsoft.Office.Interop.Word.Application _wordApp;
+
+        public OfficeInteropWrapper(string path)
+        {
+            _path = path;
+
+            switch (Path.GetExtension(path).ToLower())
+            {
+                case ".doc":
+                case ".docx":
+                    FileType = FileTypeEnum.Word;
+                    break;
+                case ".xls":
+                case ".xlsx":
+                    FileType = FileTypeEnum.Excel;
+                    break;
+                case ".ppt":
+                case ".pptx":
+                    FileType = FileTypeEnum.PowerPoint;
+                    break;
+                default:
+                    throw new NotSupportedException($"{path} is not supported.");
+            }
+
+            LoadApplication();
+        }
+
+        public FileTypeEnum FileType { get; }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            // communicate with COM in a separate thread
+            Task.Run(() =>
+                {
+                    try
+                    {
+                        //_wordApp?.Documents.Close(false);
+                        _wordApp?.Quit(false);
+                        _wordApp = null;
+
+                        _excelApp?.Workbooks.Close();
+                        _excelApp?.Quit();
+                        _excelApp = null;
+
+                        _powerpointApp?.Quit();
+                        _powerpointApp = null;
+                    }
+                    catch (Exception e)
+                    {
+                        Debug.WriteLine(e.Message);
+                        Debug.WriteLine(e.StackTrace);
+                    }
+                })
+                .Wait();
+        }
+
+        public string SaveAsPdf()
+        {
+            if (_wordApp == null && _excelApp == null && _powerpointApp == null)
+                throw new Exception("Office application launch failed.");
+
+            var succeeded = false;
+
+            // communicate with COM in a separate thread
+            Task.Run(() =>
+                {
+                    try
+                    {
+                        switch (FileType)
+                        {
+                            case FileTypeEnum.Word:
+                                _wordApp.ActiveDocument.ExportAsFixedFormat(_tempPdf,
+                                    WdExportFormat.wdExportFormatPDF);
+                                succeeded = true;
+                                break;
+                            case FileTypeEnum.Excel:
+                                _excelApp.ActiveWorkbook.ExportAsFixedFormat(XlFixedFormatType.xlTypePDF,
+                                    _tempPdf);
+                                succeeded = true;
+                                break;
+                            case FileTypeEnum.PowerPoint:
+                                _powerpointApp.ActivePresentation.ExportAsFixedFormat(_tempPdf,
+                                    PpFixedFormatType.ppFixedFormatTypePDF);
+                                succeeded = true;
+                                break;
+                            default:
+                                throw new NotSupportedException($"{_path} is not supported.");
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        Debug.WriteLine(e.Message);
+                        Debug.WriteLine(e.StackTrace);
+                    }
+                })
+                .Wait();
+
+            if (succeeded)
+                return FileType == FileTypeEnum.Excel
+                    ? _tempPdf + ".pdf"
+                    : _tempPdf; // Excel will add ".pdf" to our filename
+
+            Dispose();
+            return string.Empty;
+        }
+
+        private void LoadApplication()
+        {
+            var succeeded = false;
+
+            // communicate with COM in a separate thread
+            Task.Run(() =>
+                {
+                    try
+                    {
+                        switch (FileType)
+                        {
+                            case FileTypeEnum.Word:
+                                _wordApp = new Microsoft.Office.Interop.Word.Application();
+                                _wordApp.Documents.Add(_path);
+                                succeeded = true;
+                                break;
+                            case FileTypeEnum.Excel:
+                                _excelApp = new Application();
+                                _excelApp.Workbooks.Add(_path);
+                                succeeded = true;
+                                break;
+                            case FileTypeEnum.PowerPoint:
+                                _powerpointApp = new Microsoft.Office.Interop.PowerPoint.Application();
+                                _powerpointApp.Presentations.Open(_path);
+                                succeeded = true;
+                                break;
+                            default:
+                                throw new NotSupportedException($"{_path} is not supported.");
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        Debug.WriteLine(e.Message);
+                        Debug.WriteLine(e.StackTrace);
+                    }
+                })
+                .Wait();
+
+            if (!succeeded)
+                Dispose();
+        }
+
+        ~OfficeInteropWrapper()
+        {
+            Dispose();
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/PluginInterface.cs

@@ -0,0 +1,93 @@
+using System;
+using System.IO;
+using System.Windows;
+using QuickLook.Plugin.PDFViewer;
+
+namespace QuickLook.Plugin.OfficeViewer
+{
+    public class PluginInterface : IViewer
+    {
+        private string _pdfPath = "";
+        private PdfViewerControl _pdfViewer;
+
+        public int Priority => int.MaxValue;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            switch (Path.GetExtension(path).ToLower())
+            {
+                case ".doc":
+                case ".docx":
+                case ".xls":
+                case ".xlsx":
+                case ".ppt":
+                case ".pptx":
+                    return true;
+            }
+
+            return false;
+        }
+
+        public void Prepare(string path, ViewContentContainer container)
+        {
+            container.SetPreferedSizeFit(new Size {Width = 800, Height = 600}, 0.8);
+        }
+
+        public void View(string path, ViewContentContainer container)
+        {
+            using (var officeApp = new OfficeInteropWrapper(path))
+            {
+                _pdfPath = officeApp.SaveAsPdf();
+            }
+
+            if (string.IsNullOrEmpty(_pdfPath))
+                throw new Exception("COM failed.");
+
+            _pdfViewer = new PdfViewerControl();
+
+            _pdfViewer.Loaded += (sender, e) =>
+            {
+                try
+                {
+                    _pdfViewer.LoadPdf(_pdfPath);
+                }
+                catch (Exception ex)
+                {
+                    throw ex;
+                }
+
+                container.Title = $"{Path.GetFileName(path)} (1 / {_pdfViewer.TotalPages})";
+            };
+            _pdfViewer.CurrentPageChanged += (sender, e) => container.Title =
+                $"{Path.GetFileName(path)} ({_pdfViewer.CurrectPage + 1} / {_pdfViewer.TotalPages})";
+
+            container.SetContent(_pdfViewer);
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            // release the Pdf file first
+            _pdfViewer?.Dispose();
+            _pdfViewer = null;
+
+            try
+            {
+                File.Delete(_pdfPath);
+            }
+            catch (Exception)
+            {
+                // ignored
+            }
+        }
+
+        ~PluginInterface()
+        {
+            Dispose();
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/Properties/AssemblyInfo.cs

@@ -0,0 +1,53 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("QuickLook.Plugin.OfficeViewer")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("QuickLook.Plugin.OfficeViewer")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+    //(used if a resource is not found in the page,
+    // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+    //(used if a resource is not found in the page,
+    // app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/Properties/Resources.Designer.cs

@@ -0,0 +1,62 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace QuickLook.Plugin.OfficeViewer.Properties {
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if ((resourceMan == null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("QuickLook.Plugin.OfficeViewer.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/Properties/Resources.resx

@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/Properties/Settings.Designer.cs

@@ -0,0 +1,26 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace QuickLook.Plugin.OfficeViewer.Properties {
+    
+    
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "15.1.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase {
+        
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+        
+        public static Settings Default {
+            get {
+                return defaultInstance;
+            }
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/Properties/Settings.settings

@@ -0,0 +1,8 @@
+<?xml version='1.0' encoding='utf-8'?>
+
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/QuickLook.Plugin.OfficeViewer.csproj

@@ -0,0 +1,112 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{E37675EA-D957-4495-8655-2609BF86756C}</ProjectGuid>
+    <OutputType>library</OutputType>
+    <RootNamespace>QuickLook.Plugin.OfficeViewer</RootNamespace>
+    <AssemblyName>QuickLook.Plugin.OfficeViewer</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>..\..\Build\Debug\Plugins\QuickLook.Plugin.OfficeViewer\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\Build\Debug\Plugins\QuickLook.Plugin.OfficeViewer\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Microsoft.Office.Interop.Excel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c, processorArchitecture=MSIL">
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+      <HintPath>..\..\packages\Microsoft.Office.Interop.Excel.15.0.4795.1000\lib\net20\Microsoft.Office.Interop.Excel.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Office.Interop.PowerPoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c, processorArchitecture=MSIL">
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+      <HintPath>..\..\packages\Microsoft.Office.Interop.PowerPoint.15.0.4420.1017\lib\net20\Microsoft.Office.Interop.PowerPoint.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Microsoft.Office.Interop.Word, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c, processorArchitecture=MSIL">
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+      <HintPath>..\..\packages\Microsoft.Office.Interop.Word.15.0.4797.1003\lib\net20\Microsoft.Office.Interop.Word.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="office, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c">
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="OfficeInteropWrapper.cs" />
+    <Compile Include="PluginInterface.cs">
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="packages.config" />
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\QuickLook\QuickLook.csproj">
+      <Project>{8b4a9ce5-67b5-4a94-81cb-3771f688fdeb}</Project>
+      <Name>QuickLook</Name>
+      <Private>False</Private>
+    </ProjectReference>
+    <ProjectReference Include="..\QuickLook.Plugin.PDFViewer\QuickLook.Plugin.PdfViewer.csproj">
+      <Project>{a82ac69c-edf5-4f0d-8cbd-8e5e3c06e64d}</Project>
+      <Name>QuickLook.Plugin.PdfViewer</Name>
+      <Private>False</Private>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/packages.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<packages>
+  <package id="Microsoft.Office.Interop.Excel" version="15.0.4795.1000" targetFramework="net452" />
+  <package id="Microsoft.Office.Interop.PowerPoint" version="15.0.4420.1017" targetFramework="net452" />
+  <package id="Microsoft.Office.Interop.Word" version="15.0.4797.1003" targetFramework="net452" />
+</packages>

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfFile.cs

@@ -23,11 +23,18 @@ namespace QuickLook.Plugin.PDFViewer
 
         public void Dispose()
         {
+            GC.SuppressFinalize(this);
+
             LibMuPdf.NativeMethods.CloseDocument(_doc);
             LibMuPdf.NativeMethods.CloseStream(_stm);
             LibMuPdf.NativeMethods.FreeContext(_ctx);
         }
 
+        ~PdfFile()
+        {
+            Dispose();
+        }
+
         public bool IsLastPage(int pageId)
         {
             return pageId >= TotalPages;

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/PdfViewerControl.xaml.cs

@@ -55,13 +55,20 @@ namespace QuickLook.Plugin.PDFViewer
 
         public void Dispose()
         {
-            _whellMonitor.Dispose();
+            GC.SuppressFinalize(this);
+
+            _whellMonitor?.Dispose();
             PdfHandleForThumbnails?.Dispose();
             PdfHandle?.Dispose();
         }
 
         public event PropertyChangedEventHandler PropertyChanged;
 
+        ~PdfViewerControl()
+        {
+            Dispose();
+        }
+
         public event EventHandler CurrentPageChanged;
 
         private void NavigatePage(object sender, MouseWheelEventArgs e)

QuickLook.Plugin/QuickLook.Plugin.PDFViewer/Plugin.cs

@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Text;
 
 namespace QuickLook.Plugin.PDFViewer
@@ -45,10 +46,17 @@ namespace QuickLook.Plugin.PDFViewer
             };
         }
 
-        public void Close()
+        public void Dispose()
         {
-            _pdfControl.Dispose();
+            GC.SuppressFinalize(this);
+
+            _pdfControl?.Dispose();
             _pdfControl = null;
         }
+
+        ~Plugin()
+        {
+            Dispose();
+        }
     }
 }

QuickLook.Plugin/QuickLook.Plugin.TextViewer/Plugin.cs

@@ -53,7 +53,7 @@ namespace QuickLook.Plugin.TextViewer
             container.Title = $"{Path.GetFileName(path)}";
         }
 
-        public void Close()
+        public void Dispose()
         {
         }
     }

QuickLook.sln

@@ -20,6 +20,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuickLook.Plugin.PdfViewer"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuickLook.Plugin.TextViewer", "QuickLook.Plugin\QuickLook.Plugin.TextViewer\QuickLook.Plugin.TextViewer.csproj", "{AE041682-E3A1-44F6-8BB4-916A98D89FBE}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuickLook.Plugin.OfficeViewer", "QuickLook.Plugin\QuickLook.Plugin.OfficeViewer\QuickLook.Plugin.OfficeViewer.csproj", "{E37675EA-D957-4495-8655-2609BF86756C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -74,6 +76,14 @@ Global
 		{AE041682-E3A1-44F6-8BB4-916A98D89FBE}.Release|Any CPU.Build.0 = Release|Any CPU
 		{AE041682-E3A1-44F6-8BB4-916A98D89FBE}.Release|x86.ActiveCfg = Release|Any CPU
 		{AE041682-E3A1-44F6-8BB4-916A98D89FBE}.Release|x86.Build.0 = Release|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Debug|x86.Build.0 = Debug|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Release|x86.ActiveCfg = Release|Any CPU
+		{E37675EA-D957-4495-8655-2609BF86756C}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -83,5 +93,6 @@ Global
 		{FE5A5111-9607-4721-A7BE-422754002ED8} = {06EFDBE0-6408-4B37-BCF2-0CF9EBEA2E93}
 		{A82AC69C-EDF5-4F0D-8CBD-8E5E3C06E64D} = {06EFDBE0-6408-4B37-BCF2-0CF9EBEA2E93}
 		{AE041682-E3A1-44F6-8BB4-916A98D89FBE} = {06EFDBE0-6408-4B37-BCF2-0CF9EBEA2E93}
+		{E37675EA-D957-4495-8655-2609BF86756C} = {06EFDBE0-6408-4B37-BCF2-0CF9EBEA2E93}
 	EndGlobalSection
 EndGlobal

QuickLook/BackgroundListener.cs

@@ -1,5 +1,4 @@
 using System.Windows.Forms;
-using QuickLook.Utilities;
 
 namespace QuickLook
 {

QuickLook/ExtensionMethods/TypeExtensions.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace QuickLook.ExtensionMethods
+{
+    internal static class TypeExtensions
+    {
+        public static T CreateInstance<T>(this Type t)
+        {
+            return (T) Activator.CreateInstance(t);
+        }
+    }
+}

QuickLook/GlobalKeyboardHook.cs

@@ -3,9 +3,9 @@ using System.Collections.Generic;
 using System.Windows.Forms;
 using QuickLook.NativeMethods;
 
-namespace QuickLook.Utilities
+namespace QuickLook
 {
-    internal class GlobalKeyboardHook
+    internal class GlobalKeyboardHook : IDisposable
     {
         private static GlobalKeyboardHook _instance;
 
@@ -18,12 +18,19 @@ namespace QuickLook.Utilities
             Hook();
         }
 
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            Unhook();
+        }
+
         internal event KeyEventHandler KeyDown;
         internal event KeyEventHandler KeyUp;
 
         ~GlobalKeyboardHook()
         {
-            Unhook();
+            Dispose();
         }
 
         internal static GlobalKeyboardHook GetInstance()

QuickLook/MainWindow.xaml.cs

@@ -16,7 +16,7 @@ namespace QuickLook
     /// <summary>
     ///     Interaction logic for MainWindow.xaml
     /// </summary>
-    internal partial class MainWindow : Window, INotifyPropertyChanged
+    internal partial class MainWindow : Window, INotifyPropertyChanged, IDisposable
     {
         internal MainWindow()
         {
@@ -25,7 +25,6 @@ namespace QuickLook
             DataContext = this;
 
             ContentRendered += (sender, e) => AeroGlass.EnableBlur(this);
-            Closed += MainWindow_Closed;
 
             buttonCloseWindow.MouseLeftButtonUp += CloseCurrentWindow;
             titlebarTitleArea.MouseLeftButtonDown += (sender, e) => DragMove();
@@ -33,14 +32,6 @@ namespace QuickLook
 
         public event PropertyChangedEventHandler PropertyChanged;
 
-        private void MainWindow_Closed(object sender, EventArgs e)
-        {
-            viewContentContainer.ViewerPlugin.Close();
-            viewContentContainer.ViewerPlugin = null;
-
-            GC.Collect();
-        }
-
         internal new void Show()
         {
             loadingIconLayer.Opacity = 1;
@@ -108,5 +99,17 @@ namespace QuickLook
         {
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            viewContentContainer?.Dispose();
+        }
+
+        ~MainWindow()
+        {
+            Dispose();
+        }
     }
 }

QuickLook/Plugin/IViewer.cs

@@ -6,6 +6,6 @@
         bool CanHandle(string path);
         void Prepare(string path, ViewContentContainer container);
         void View(string path, ViewContentContainer container);
-        void Close();
+        void Dispose();
     }
 }

QuickLook/Plugin/InfoPanel/PluginInterface.cs

@@ -1,8 +1,9 @@
-using System.Windows;
+using System;
+using System.Windows;
 
 namespace QuickLook.Plugin.InfoPanel
 {
-    public class PluginInterface : IViewer
+    public class PluginInterface : IViewer, IDisposable
     {
         private InfoPanel _ip;
 
@@ -28,9 +29,14 @@ namespace QuickLook.Plugin.InfoPanel
             container.SetContent(_ip);
         }
 
-        public void Close()
+        public void Dispose()
         {
             _ip.Stop = true;
         }
+
+        ~PluginInterface()
+        {
+            Dispose();
+        }
     }
 }

QuickLook/Plugin/ViewContentContainer.xaml.cs

@@ -10,7 +10,7 @@ namespace QuickLook.Plugin
     /// <summary>
     ///     Interaction logic for ViewContentContainer.xaml
     /// </summary>
-    public partial class ViewContentContainer : UserControl, INotifyPropertyChanged
+    public partial class ViewContentContainer : UserControl, INotifyPropertyChanged, IDisposable
     {
         private string _title = string.Empty;
 
@@ -35,6 +35,13 @@ namespace QuickLook.Plugin
 
         public bool CanResize { get; set; } = true;
 
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            ViewerPlugin?.Dispose();
+        }
+
         public event PropertyChangedEventHandler PropertyChanged;
 
         public void SetContent(object content)
@@ -71,5 +78,10 @@ namespace QuickLook.Plugin
         {
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
+
+        ~ViewContentContainer()
+        {
+            Dispose();
+        }
     }
 }

QuickLook/PluginManager.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using QuickLook.ExtensionMethods;
 using QuickLook.Plugin;
 using QuickLook.Plugin.InfoPanel;
 
@@ -17,9 +18,9 @@ namespace QuickLook
             LoadPlugins();
         }
 
-        internal IViewer DefaultPlugin { get; set; } = new PluginInterface();
+        internal Type DefaultPlugin { get; } = typeof(PluginInterface);
 
-        internal List<IViewer> LoadedPlugins { get; private set; } = new List<IViewer>();
+        internal List<Type> LoadedPlugins { get; private set; } = new List<Type>();
 
         internal static PluginManager GetInstance()
         {
@@ -32,9 +33,10 @@ namespace QuickLook
                 return null;
 
             var matched = GetInstance()
-                .LoadedPlugins.FirstOrDefault(plugin => plugin.CanHandle(path));
+                .LoadedPlugins.FirstOrDefault(plugin => plugin.CreateInstance<IViewer>().CanHandle(path))
+                ?.CreateInstance<IViewer>();
 
-            return matched ?? DefaultPlugin;
+            return matched ?? DefaultPlugin.CreateInstance<IViewer>();
         }
 
         private void LoadPlugins()
@@ -49,10 +51,10 @@ namespace QuickLook
                                 where !t.IsInterface && !t.IsAbstract
                                 where typeof(IViewer).IsAssignableFrom(t)
                                 select t).ToList()
-                            .ForEach(type => LoadedPlugins.Add((IViewer) Activator.CreateInstance(type)));
+                            .ForEach(type => LoadedPlugins.Add(type));
                     });
 
-            LoadedPlugins = LoadedPlugins.OrderByDescending(i => i.Priority).ToList();
+            LoadedPlugins = LoadedPlugins.OrderByDescending(i => i.CreateInstance<IViewer>().Priority).ToList();
         }
     }
 }

QuickLook/QuickLook.csproj

@@ -51,6 +51,7 @@
   <ItemGroup>
     <Reference Include="FontAwesome.WPF, Version=4.7.0.37774, Culture=neutral, PublicKeyToken=0758b07a11a4f466, processorArchitecture=MSIL">
       <HintPath>..\packages\FontAwesome.WPF.4.7.0.9\lib\net40\FontAwesome.WPF.dll</HintPath>
+      <EmbedInteropTypes>False</EmbedInteropTypes>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Data" />
@@ -74,6 +75,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="ExtensionMethods\TypeExtensions.cs" />
     <Compile Include="PluginManager.cs" />
     <Compile Include="Plugin\InfoPanel\Extensions.cs" />
     <Compile Include="Plugin\InfoPanel\FileHelper.cs" />
@@ -110,7 +112,7 @@
     <Compile Include="NativeMethods\User32.cs" />
     <Compile Include="Properties\Annotations.cs" />
     <Compile Include="Utilities\AeroGlass.cs" />
-    <Compile Include="Utilities\GlobalKeyboardHook.cs" />
+    <Compile Include="GlobalKeyboardHook.cs" />
     <Compile Include="MainWindow.xaml.cs">
       <DependentUpon>MainWindow.xaml</DependentUpon>
       <SubType>Code</SubType>

QuickLook/ViewWindowManager.cs

@@ -1,7 +1,9 @@
 using System;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using QuickLook.ExtensionMethods;
 using QuickLook.Plugin;
 using QuickLook.Utilities;
 
@@ -33,16 +35,24 @@ namespace QuickLook
         private void BeginShowNewWindow(IViewer matchedPlugin, string path)
         {
             _viewWindow = new MainWindow();
-            _viewWindow.Closed += (sender2, e2) => { _viewWindow = null; };
+            _viewWindow.Closed += (sender2, e2) =>
+            {
+                _viewWindow.Dispose();
+                _viewWindow = null;
+                GC.Collect();
+            };
 
             try
             {
                 _viewWindow.BeginShow(matchedPlugin, path);
             }
-            catch (Exception) // if current plugin failed, switch to default one
+            catch (Exception e) // if current plugin failed, switch to default one
             {
-                if (matchedPlugin.GetType() != PluginManager.GetInstance().DefaultPlugin.GetType())
+                Debug.WriteLine(e.ToString());
-                    _viewWindow.BeginShow(PluginManager.GetInstance().DefaultPlugin, path);
+                Debug.WriteLine(e.StackTrace);
+
+                if (matchedPlugin.GetType() != PluginManager.GetInstance().DefaultPlugin)
+                    _viewWindow.BeginShow(PluginManager.GetInstance().DefaultPlugin.CreateInstance<IViewer>(), path);
             }
         }
 
@@ -51,9 +61,6 @@ namespace QuickLook
             if (_viewWindow != null)
             {
                 _viewWindow.Close();
-                _viewWindow = null;
-
-                GC.Collect();
 
                 return true;
             }