Fix: Fixed crash that would occur at the start of a file operation if…

… Explorer wasn't running (#13670)

src/Files.App/Utils/Shell/Win32API.cs

@@ -570,7 +570,15 @@ public static Task<bool> MountVhdDisk(string vhdPath)
 		public static Shell32.ITaskbarList4? CreateTaskbarObject()
 		{
 			var taskbar2 = new Shell32.ITaskbarList2();
-			taskbar2.HrInit();
+			try
+			{
+				taskbar2.HrInit();
+			}
+			catch (NotImplementedException)
+			{
+				// explorer.exe is not running as a shell
+				return null;
+			}
 
 			return taskbar2 as Shell32.ITaskbarList4;
 		}

src/Files.App/Utils/Storage/Operations/FileOperationsHelpers.cs

@@ -947,14 +947,14 @@ public class OperationWithProgress
 				public bool Canceled { get; set; }
 			}
 
-			private readonly Shell32.ITaskbarList4 taskbar;
+			private readonly Shell32.ITaskbarList4? taskbar;
 			private readonly ConcurrentDictionary<string, OperationWithProgress> operations;
 
 			public HWND OwnerWindow { get; set; }
 
 			public ProgressHandler()
 			{
-				taskbar = Win32API.CreateTaskbarObject()!;
+				taskbar = Win32API.CreateTaskbarObject();
 				operations = new ConcurrentDictionary<string, OperationWithProgress>();
 				operationsCompletedEvent = new ManualResetEvent(true);
 			}
@@ -1034,7 +1034,8 @@ protected override void Dispose(bool disposing)
 				if (disposing)
 				{
 					operationsCompletedEvent?.Dispose();
-					Marshal.ReleaseComObject(taskbar);
+					if (taskbar is not null)
+						Marshal.ReleaseComObject(taskbar);
 				}
 			}
 		}