ms project

How can I open damaged .Microsoft project mpp file? I wanted to continue working on my big project but MS informed me that the file is incorrect.

tried to open the file in MS Project 2007 and got an error says: "an unexpected error has Occurred while opening the file The file may be corrupted Try to use the backup . . . Has anyone encountered this error ?

I come to you with a problem – yesterday the computer showed This application failed to start because MICROSOFT.OFFICE.PROJECT.SERVER.DATABASE.DLL was not found. Re-installing the application may fix this problem. Please help to recover microsoft project file here after such a failure.