Cannot see shared folders or mapped drives on XBox 360's Media Center Extender that are visible on the Vista Media Center PC

On my Vista PC named Jupiter and running Media Center, I logon as Alin and I am able to see shares from another computers (e.g. from a Linux box that is my NAS device). Some of these drives are mapped to local drives on my account, e.g. M:\ -> \\nas\media\music. 

I setup my Xbox 360 as a Media Center Extender, however when I go to the Library setup and I try to add a new folder to the library, I am no able to select the shares from my NAS device: in the local drives I only see the C:\ drive, and in the folders shared by other computers I don't see the shares from the Linux box...

Media Center Extender uses a local username named something like MCX1 on the MC PC. It is for this MCX1 user that you have to map a drive to the shared folder to make it appear in the Library as a local drive... This can be done with a NetLogon script.

Start by creating a folder %Windir%\System32\Repl\Import\Scripts. Now create a batch file, where you map the drives.  An example might look like this:

    @echo off
    set CREDENTIALS=/user:LinuxBox\[Username] [Password]
    net use P: "\\LinuxBox\media\Pictures" %CREDENTIALS%
    net use M: "\\LinuxBox\media\Music" %CREDENTIALS% 

Save this file in the folder you created earlier, e.g. as MCXLogonScript.cmd. The location is important. I've read articles this logon file should be placed in C:\netlogon; the help mentions it should be saved in \\vistapc\netlogon share, etc., but none of those worked for me. I found the correct path where Windows was looking for the file with ProcessMonitor, and that path on my Vista box was %Windir%\System32\Repl\Import\Scripts.

It's time to associate the logon script with the MCX1 user.  Go to Control Panel -> Administrative Tools -> Computer Management. Under SystemTools/LocalUsersAndGroups/Users, select the MCX1 user and display its Properties. In the Profile tab, type just the file name, MCXLogonScript.cmd.

Go to the XBox 360. Close and reopen Media Center here - it will logout and re-login on the PC with the MCX1 user, and this time it will read the logon script and map the drives. If you go now to Tasks/Setting/LibrarySetup and choose AddFoldersToWatch and select AddFoldersOnThisComputer, now you should see the M:\ and P:\ drives that were mapped by the logon script beside the C:\ drive.