this.Get<Button>("SaveFilePicker").Click += async delegate
            {
                var fileTypes = GetFileTypes();
                var folderPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                var mainWindow = Application.Current?.ApplicationLifetime as IClassicDesktopStyleApplicationLifetime ;
                var topLevel = TopLevel.GetTopLevel(mainWindow.MainWindow);

                var saveFolder = await topLevel.StorageProvider.TryGetFolderFromPathAsync(folderPath);

                var file = await GetStorageProvider().SaveFilePickerAsync(new FilePickerSaveOptions()
                {
                    Title = "Save file",
                    FileTypeChoices = fileTypes,
                    SuggestedStartLocation = saveFolder,
                    SuggestedFileName = "FileName",
                    ShowOverwritePrompt = true
                });