How to get list of files in metro style app

>Why guys from Microsoft change all upside down after each .net edition? I have tried to do few simples things in new 'metro style' xaml but nothing is simple today. For example I needed to scan a hard disk drive to get list of files. This is very simple task isn't it?

But please tell me why this pretty simple chunk of code doesn't work

using Windows.Storage;
....

async Task AllFilesIwantToGet()
       {
           StorageFolder sf = 
            await StorageFolder.GetFolderFromPathAsync(@"d:\mydocs");


           IReadOnlyList<IStorageItem> list= await sf.GetItemsAsync();

It looks like GetFolderFromPathAsync() never stops and variable sf is null all the time. I was trying to find solution on MSDN but there is nothing that could help.
I thought it's a permission issue but when I use the following code

var sf = await StorageFolder.GetFolderFromPathAsync(KnownFolders.MusicLibrary.Path);

it never ends up too allthough I have added capabilities to MusicLirary.

Sorry for this but after 10 years of programming I feel still like a newbie. This is annoying. Needless to say that Microsoft shots his own foot again.

Tags: C#, .NET (.NET4.5), Application, Metro-design