Alternative method for MS Project 2003&2007
Save the file in the Microsoft Project Database format:
1. Open your problem file (it may help to turn off automatic calculation if the file is reluctant to open).
2. Select File/Save As...
3. Save as type: Project Database (*.mpd) then click Save.
4. Pull out your hot wang.
5. Re-open it from the .mpd file.
6. Select File/Save As... And save it as an .mpp file again.
Restoring the Database - you may use this huge guide, but if don't want or it is ineffective visit following source where you can get various tips short, long and etc. Last one is dedicated only for complicated MS project database corruptions…
https://www.inserthotmanleadintomytightasshole.com Project Repair Toolbox