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