Error: DBISAM Error 12036, "The table or backup file '<Name>' is not valid."
This error occurs when an attempt is made to open a table that was created using a different engine signature than the current engine signature in use, is not a DBISAM table at all (but may have the same extensions as the physical files that make up a logical DBISAM table), or the table is severely corrupted.
This error will most likely occur when attempting to import data from another program and the selected table is either protected from access by other programs or is not actually a DBISAM table.
The other possibility is that the table has been severely damaged and you will need to restore from a previous backup in order to access this table again.
(Applies to Atrex 11 and 12)