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KB #240049: Error 5172 ‘FILE SIZE Property is incorrect’ when attaching a database
Under certain conditions you may get the following error when attempting to attach an encrypted database:Error 5142: The header for ‘northwnd.mdf’ is not a valid database header.
The FILE SIZE property is incorrect.
This is a rare error, and has been fixed in driver versions nlem*.sys v2005.201.11.0 or later. We recommend that you contact us if you have this issue with a newer version and still experience this error.
240051: Database becomes suspect when used with some Anti Virus Software