RESTORE unable to open file '%1'

Error constant SQLE_RESTORE_UNABLE_TO_OPEN
ODBC 2 State ERROR
ODBC 3 State ERROR
Parameter 1 File name of database file.
Severity 21
SQLCODE –717
SQLSTATE WB008
Sybase error code 13726
Probable cause

RESTORE was unable to open one of the database files.