Unrecognized database format <filename>. (Error 3343)
- The specified file name is not a Microsoft Access database engine database.
- The specified file name is a device name, for example, a printer or a console.
- The database file has invalid header information or an unknown sort order.
- A commit is pending from another user but the lock file cannot be found.
- During a commit, you are attempting to write a Long value larger than the 2K maximum page size.
- The database is damaged. Compact the database and then try opening it again.