Update

Author: 0x5bfa

src/Files.App/ViewModels/UserControls/Previews/ShellPreviewViewModel.cs

@@ -13,7 +13,6 @@
 using Windows.Win32.Graphics.Dxgi;
 using Windows.Win32.Graphics.DirectComposition;
 using Windows.Win32.Graphics.Dwm;
-using Windows.Win32.System.Registry;
 using Windows.Win32.UI.Shell;
 using Windows.Win32.UI.WindowsAndMessaging;
 using WinRT;
@@ -26,10 +25,6 @@ namespace Files.App.ViewModels.Previews
 {
 	public sealed class ShellPreviewViewModel : BasePreviewModel
 	{
-		private static readonly Guid IPreviewHandlerIid = new(0x8895b1c6, 0xb41f, 0x4c1c, 0xa5, 0x62, 0x0d, 0x56, 0x42, 0x50, 0x83, 0x6f);
-		private static readonly Guid QueryAssociationsClsid = new(0xa07034fd, 0x6caa, 0x4954, 0xac, 0x3f, 0x97, 0xa2, 0x72, 0x16, 0xf9, 0x8a);
-		private static readonly Guid IQueryAssociationsIid = new(0xc46ca590, 0x3c3f, 0x11d2, 0xbe, 0xe6, 0x00, 0x00, 0xf8, 0x05, 0xca, 0x57);
-
 		PreviewHandler? currentHandler;
 		ContentExternalOutputLink? outputLink;
 		WNDCLASSEXW? wCls;
@@ -108,9 +103,10 @@ private unsafe LRESULT WndProc(HWND hwnd, uint msg, WPARAM wParam, LPARAM lParam
 				var clsid = FindPreviewHandlerFor(Item.FileExtension, hwnd.Value);
 
 				isOfficePreview = new Guid?[] {
-					Guid.Parse("84F66100-FF7C-4fb4-B0C0-02CD7FB668FE"),
+					Guid.Parse("84F66100-FF7C-4fb4-B0C0-02CD7FB668FE"), // 
 					Guid.Parse("65235197-874B-4A07-BDC5-E65EA825B718"),
-					Guid.Parse("00020827-0000-0000-C000-000000000046") }.Contains(clsid);
+					Guid.Parse("00020827-0000-0000-C000-000000000046")
+				}.Contains(clsid);
 
 				try
 				{
@@ -138,21 +134,18 @@ private unsafe LRESULT WndProc(HWND hwnd, uint msg, WPARAM wParam, LPARAM lParam
 		public unsafe void LoadPreview(UIElement presenter)
 		{
 			var parent = MainWindow.Instance.WindowHandle;
+			var hInst = PInvoke.GetModuleHandle(default(PWSTR));
+			var szClassName = $"{GetType().Name}-{Guid.NewGuid()}";
+			var szWindowName = $"Preview";
 
-			HINSTANCE hInst = PInvoke.GetModuleHandle(default(PWSTR));
-
-			string className = $"{GetType().Name}{Guid.NewGuid()}";
-
-			fixed (char* pszClassName = className)
+			fixed (char* pszClassName = szClassName)
 			{
-				PWSTR pwszClassName = new(pszClassName);
-
 				wCls = new WNDCLASSEXW
 				{
 					cbSize = (uint)Marshal.SizeOf(typeof(WNDCLASSEXW)),
 					lpfnWndProc = new(WndProc),
 					hInstance = hInst,
-					lpszClassName = pwszClassName,
+					lpszClassName = pszClassName,
 					style = 0,
 					hIcon = default,
 					hIconSm = default,
@@ -163,14 +156,12 @@ public unsafe void LoadPreview(UIElement presenter)
 					cbWndExtra = 0,
 				};
 
-				fixed (char* pszWindowName = "Preview")
+				fixed (char* pszWindowName = szWindowName)
 				{
-					PWSTR lpwszWindowName = new(pszWindowName);
-
 					hwnd = PInvoke.CreateWindowEx(
 						WINDOW_EX_STYLE.WS_EX_LAYERED | WINDOW_EX_STYLE.WS_EX_COMPOSITED,
 						wCls.Value.lpszClassName,
-						lpwszWindowName,
+						pszWindowName,
 						WINDOW_STYLE.WS_CHILD | WINDOW_STYLE.WS_CLIPSIBLINGS | WINDOW_STYLE.WS_VISIBLE,
 						0, 0, 0, 0,
 						new(parent),