Get GUID for DosDevice.

To start with, run:

mountvol /?
mountvol /L

You will see available mount points for your system.

See http://technet.microsoft.com/en-us/library/cc772586%28WS.10%29.aspx[^].

Read this CodeProject article: Inside Mountvol.exe[^] about volume mount points and SDK APIs.

See also:
http://msdn.microsoft.com/en-us/library/dd541832%28PROT.10%29.aspx[^],
http://msdn.microsoft.com/en-us/library/cc225342%28v=PROT.10%29.aspx[^],
http://msdn.microsoft.com/en-us/library/dd303455%28v=PROT.10%29.aspx[^].

—SA