diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
index bc0ec94..89cdea3 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/Helper.cs
@@ -48,7 +48,7 @@ internal static class Helper
                 uri.Append('/');
             else
                 uri.Append($"%{(int)v:X2}");
-        if (uri.Length >= 2 && uri[0] == '/' && uri[1] == '/') // UNC path
+        if (uri.Length >= 2 && uri[0] == '/' && uri[1] == '/') // UNC path - Universal Naming Convention
             uri.Insert(0, "file:");
         else
             uri.Insert(0, "file:///");
diff --git a/QuickLook/ViewerWindow.xaml.cs b/QuickLook/ViewerWindow.xaml.cs
index 3636246..46b63b6 100644
--- a/QuickLook/ViewerWindow.xaml.cs
+++ b/QuickLook/ViewerWindow.xaml.cs
@@ -115,7 +115,7 @@ public partial class ViewerWindow : Window
         {
             try
             {
-                Clipboard.SetText(_path);
+                Clipboard.SetText($"\"{(_path.Length >= 260 ? @"\\?\" + _path : _path)}\"");
                 Toast.Success(TranslationHelper.Get("InfoPanelMoreItem_CopySucc"));
             }
             catch (Exception e)