Has GetDrives Stopped Enumerating Mapped Drives in Windows7 ?

[nsnb]

I have been using the very useful GetDrives function for a while, but only today I discovered that while it continues to work perfectly on Windows XP, it doesn't list network-mapped drives on Windows 7.

(I tried both the default "ALL" and the more specific "FDD+HDD+CDROM+NET+RAM" option)

Is this known behavior?

Any suggestion how to enumerate all drives (including mapped network shares) on Windows 7?