What can i use when platform not supported for OpenFileDialog in C#

   try
            {
                Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog dlg = new Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog
                {
                    ShowPlacesList = true,
                    Multiselect = false,
                    InitialDirectory = "",
                    IsFolderPicker = false,
                    AddToMostRecentlyUsedList = false,
                    EnsurePathExists = true,
                    EnsureFileExists = true,
                    EnsureValidNames = true,
                    Title = "Open Model"
                    //DefaultDirectory = ""
                    //EnsureReadOnly = false
                    //AllowNonFileSystemItems = false
            };

                dlg.Filters.Add(new Microsoft.WindowsAPICodePack.Dialogs.CommonFileDialogFilter("Text Files", "*.txt"));

                if (dlg.ShowDialog() == Microsoft.WindowsAPICodePack.Dialogs.CommonFileDialogResult.Ok)
                {
                    return dlg.FileName;
                }
            }
            catch (System.PlatformNotSupportedException)
            {
                //TODO: Support will added for not supported platforms
            }

            return null;

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