It's useful to know where 4D stores its serial numbers, in case you want to delete your licenses from a machine, or if you'd like to re-enter the licenses from scratch.
4D v6.5 stores serial numbers in a different place than v6 does.
If you're using Windows 95 or Windows 98 and your boot volume is drive C, v6 serial numbers are stored in the file at:
On Windows NT or Windows 2000, the v6 serial numbers are stored in the file at:
In 4D v6.5 on Windows, the serial numbers are stored in the Registry at: