你好，
你的需求在官方的sample中有部分实现：https://code.msdn.microsoft.com/windowsapps/File-picker-sample-9f294cba
在其中第三个案例中，使用到了ContinuationManager 帮助类，它可以记住在进行下一步时，用户的操作和完成的任务。
然后使用 FolderPickerContinuationEventArgs.Folder 属性就可以记录文件夹：
http://msdn.microsoft.com/en-us/library/windows.applicationmodel.activation.folderpickercontinuationeventargs.folder.aspx
private void PickFolderButton_Click(object sender, RoutedEventArgs e)
{
// Clear previous returned folder name, if it exists, between iterations of this scenario
OutputTextBlock.Text = "";
FolderPicker folderPicker = new FolderPicker();
folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
folderPicker.FileTypeFilter.Add(".docx");
folderPicker.FileTypeFilter.Add(".xlsx");
folderPicker.FileTypeFilter.Add(".pptx");
folderPicker.PickFolderAndContinue();
}
/// <summary>
/// Handle the returned folder from folder picker
/// This method is triggered by ContinuationManager based on ActivationKind
/// </summary>
/// <param name="args">Folder picker continuation activation argment. It cantains the folder user selected with folder picker </param>
public void ContinueFolderPicker(FolderPickerContinuationEventArgs args)
{
StorageFolder folder = args.Folder;
if (folder != null)
{
// Application now has read/write access to all contents in the picked folder (including other sub-folder contents)
// 应用现在对于所选文件夹内的文件均获得读写权限（包括子文件夹）
StorageApplicationPermissions.FutureAccessList.AddOrReplace("PickedFolderToken", folder);
OutputTextBlock.Text = "Picked folder: " + folder.Name;
}
else
{
OutputTextBlock.Text = "Operation cancelled.";
}
}
当应用加载的时候，只需要获得FutureAccessList中的数据，即可实现你要的效果，可参考以下文档：
#How to track recently used files and folders
http://msdn.microsoft.com/en-us/library/windows/apps/xaml/Hh972344(v=win.10).aspx
String mruFirstToken = StorageApplicationPermissions.MostRecentlyUsedList.Entries.First.Token;
StorageFile retrievedFile = await StorageApplicationPermissions.MostRecentlyUsedList.GetFileAsync(mruFirstToken);
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