If Microsoft Project cannot open a file, you can repair corrupted Microsoft Project files by following the solutions mentioned in this post.

The files are created by Microsoft XPS Document Writer, but can be opened by Microsoft XPS Viewer. You may access the Viewer directly, or open it through the file.

How to Open a Microsoft SQL Server .Bak File. You can save a backup of your MS SQL databases to a single file on your hard drive. These backup files have names ending with the ".bak" file ...