Add ability to change root directory

[danio43us67]

When using Windows 11, the ability to change the root directory is missing. The app only has access to the desktop.

[Ybalrid]

For me on Win11 it is working fine as "This PC" is a child of "Desktop", and all the other drives are children of "This PC" on that standard Windows tree view.

Tho, there's probably a more modern Folder picker in Win32 that might be better to use than this one?