File Transfer doesn't work with mapped drives if Radmin Server is run as a service under WinNT-based OS. On NT machines mapped drives are created by credentials of user that actually map them. If you create them and RAdmin is started as an application everything's OK. But if you create them and RAdmin is started as a service, it has credentials of "localsystem", and they are different from credentials of user that map network drives. As a result, RAdmin cannot access network/mapped drives. Unfortunately, there is no way to access mapped drive of another user - it would be a great security hole. So you have the following ways:
1. Run Radmin Server as an application with credentials of certain user
2. Use Windows 95/98/ME on server machines
3. Use other technique than mapped drives - for example, some virtual drive software.
Famatech Technical Support