You can write to this address, they have a nice subroutine to obtain the Serial Number from a Disk, and work well with Visual Foxpro. You can Obtain a copy also from the "Files" section of Universal Thread web site at:
http://www.levelextreme.com/Azimuth Directions Inc.
6000 Yonge St., App. 1809
North York, Ontario, M2M 3W1, Canada
E-mail:
vladt@poboxes.com