Windows 7 Can't map network drive

[firefusion]

I'm trying to user WebDrive on Windows 7 RC Bulid 7100 and i'm getting the following error when trying to connect to an FTP connection.

Can't map network drive: (1204) The specified network provider name is invalid.

WebDrive is a well know program that maps FTP connections as if they were removable drives. It works fine on Vista.

Any ideas?