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Automatically fix Office preview handler registry

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This function requires QuickLook to run with administrator privileges and preview the corresponding Office file once
This commit is contained in:
ema
2025-06-12 15:25:18 +08:00
parent 9a3591e6f6
commit e2e5885fd5
4 changed files with 103 additions and 35 deletions
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66
QuickLook.Plugin/QuickLook.Plugin.OfficeViewer/ShellExRegister.cs Normal file
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using Microsoft.Win32;
using System;
using System.IO;
using System.Security.Principal;
namespace QuickLook.Plugin.OfficeViewer;
internal static class ShellExRegister
{
/// <summary>
/// Returns the GUID of the preview handler associated with the specified file extension.
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
public static Guid GetPreviewHandlerGUID(string fileExtension)
{
// open the registry key corresponding to the file extension
var ext = Registry.ClassesRoot.OpenSubKey(fileExtension);
if (ext != null)
{
// open the key that indicates the GUID of the preview handler type
// Such as `Computer\HKEY_CLASSES_ROOT\.docx\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}`
// Such as `Computer\HKEY_CLASSES_ROOT\.xlsx\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}`
var test = ext.OpenSubKey(@"shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}");
if (test != null) return new Guid(Convert.ToString(test.GetValue(null)));
// sometimes preview handlers are declared on key for the class
var className = Convert.ToString(ext.GetValue(null));
if (className != null)
{
// Such as `Computer\HKEY_CLASSES_ROOT\{CLASS_NAME}\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}`
test = Registry.ClassesRoot.OpenSubKey(
className + @"\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}");
if (test != null) return new Guid(Convert.ToString(test.GetValue(null)));
}
}
return Guid.Empty;
}
/// <summary>
/// Set the GUID of the preview handler associated with the specified file extension.
/// </summary>
/// <param name="fileExtension"></param>
/// <param name="guid"></param>
public static void SetPreviewHandlerGUID(string fileExtension, Guid guid)
{
// open the registry key corresponding to the file extension
var ext = Registry.ClassesRoot.OpenSubKey(fileExtension);
if (ext != null)
{
// open the key that indicates the GUID of the preview handler type
// Such as `Computer\HKEY_CLASSES_ROOT\.docx\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}`
// Such as `Computer\HKEY_CLASSES_ROOT\.xlsx\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}`
var test = ext.OpenSubKey(@"shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}", true);
test?.SetValue(null, guid.ToString("B"));
}
}
public static bool IsRunAsAdmin()
{
using WindowsIdentity identity = WindowsIdentity.GetCurrent();
WindowsPrincipal principal = new(identity);
return principal.IsInRole(WindowsBuiltInRole.Administrator);
}
}