Fixed the first issue

Author: 0x5bfa

src/Files.App/NativeMethods.txt

@@ -106,4 +106,5 @@ UnregisterClass
 SetWindowLong
 GetModuleHandle
 RegisterClassEx
-CREATESTRUCTW
+CREATESTRUCTW
+AssocQueryString

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

@@ -48,52 +48,29 @@ public async override Task<List<FileProperty>> LoadPreviewAndDetailsAsync()
 			if (string.IsNullOrEmpty(extension))
 				return null;
 
-			var hr = PInvoke.AssocCreate(QueryAssociationsClsid, IQueryAssociationsIid, out var queryAssocObject);
-			if (!hr.Succeeded)
-				return null;
-
 			try
 			{
-				if (queryAssocObject is not IQueryAssociations queryAssoc)
-					return null;
-
-				fixed (char* pszExtension = extension)
+				fixed (char* pszOutput = new char[1024])
 				{
-					PWSTR lpwszExtension = new(pszExtension);
-
-					queryAssoc.Init(ASSOCF.ASSOCF_INIT_DEFAULTTOSTAR, lpwszExtension, HKEY.Null, new(hwnd));
-
-					fixed (char* pszIPreviewHandlerIID = IPreviewHandlerIid.ToString())
-					{
-						PWSTR lpwszIPreviewHandlerIID = new(pszIPreviewHandlerIID);
-
-						fixed (char* pszOutput = new char[256])
-						{
-							PWSTR lpwszOutput = new(pszOutput);
-							uint cchOutput = 256u;
-
-							queryAssoc.GetString(
-								ASSOCF.ASSOCF_NOTRUNCATE,
-								ASSOCSTR.ASSOCSTR_SHELLEXTENSION,
-								lpwszIPreviewHandlerIID,
-								lpwszOutput,
-								ref cchOutput);
-
-							Debug.WriteLine($"Preview handler for {lpwszExtension.ToString()}: {lpwszOutput.ToString()}");
-
-							return Guid.Parse(lpwszOutput.ToString());
-						}
-					}
+					PWSTR pwszOutput = new(pszOutput);
+					uint cchOutput = 512u;
+
+					// Try to find registered preview handler associated with specified extension name
+					var res = PInvoke.AssocQueryString(
+						ASSOCF.ASSOCF_NOTRUNCATE,
+						ASSOCSTR.ASSOCSTR_SHELLEXTENSION,
+						extension,
+						"{8895b1c6-b41f-4c1c-a562-0d564250836f}",
+						pszOutput,
+						ref cchOutput);
+
+					return Guid.Parse(pwszOutput.ToString());
 				}
 			}
 			catch
 			{
 				return null;
 			}
-			finally
-			{
-				Marshal.ReleaseComObject(queryAssocObject);
-			}
 		}
 
 		public void SizeChanged(RECT size)