Use api functions instead

Author: Jack251970

Flow.Launcher/PublicAPIInstance.cs

@@ -356,7 +356,7 @@ public void OpenDirectory(string DirectoryPath, string FileNameOrFilePath = null
             catch (System.ComponentModel.Win32Exception ex) when (ex.NativeErrorCode == 2)
             {
                 // File Manager not found
-                MessageBoxEx.Show(
+                ShowMsgBox(
                     string.Format(GetTranslation("fileManagerNotFound"), ex.Message),
                     GetTranslation("fileManagerNotFoundTitle"),
                     MessageBoxButton.OK,
@@ -366,7 +366,7 @@ public void OpenDirectory(string DirectoryPath, string FileNameOrFilePath = null
             catch (Exception ex)
             {
                 // Other exceptions
-                MessageBoxEx.Show(
+                ShowMsgBox(
                     string.Format(GetTranslation("folderOpenError"), ex.Message),
                     GetTranslation("errorTitle"),
                     MessageBoxButton.OK,

Flow.Launcher/SelectFileManagerWindow.xaml.cs

@@ -61,7 +61,7 @@ private void btnDone_Click(object sender, RoutedEventArgs e)
             // Check if the selected file manager path is valid
             if (!IsFileManagerValid(CustomExplorer.Path))
             {
-                MessageBoxResult result = MessageBoxEx.Show(
+                var result = App.API.ShowMsgBox(
                     string.Format((string)Application.Current.FindResource("fileManagerPathNotFound"), 
                         CustomExplorer.Name, CustomExplorer.Path),
                     (string)Application.Current.FindResource("fileManagerPathError"),