Microsoft Project files can get corrupted much the same as other application files. Project’s file format is MPP, and Project won’t open corrupted MPP files. An error message will usually pop up when users try to open corrupted MPP files. However, that doesn’t necessarily mean there’s no way to salvage a corrupted Project file.

How can Users Fix Microsoft Project Files?

1. Is There a Previous Version Backup?

  1. Users who have enabled File History and System Restore might be able to salvage previous versions of MPP files. To do that, press the Windows key + E hotkey to open File Explorer.
  2. Then open the folder that includes the MPP file.
  3. Right-click the MPP file and select Properties.
  4. Click the Previous Versions tab shown directly below.

    Previous Versions tab microsoft project won't open file

  5. Select a previous file version if there is one.
  6. Then press the Restore button.
  7. Open the previous MPP file version in Microsoft Project.

2. Fix the MPP With Recovery Toolbox for Project

  1. Users who can’t restore MPP files will need to fix the corrupted files with file repair software such as Recovery Toolbox for Project. To try out a trial version of the $27 Recovery Toolbox, click the Download button on that utility’s page.
  2. Open the installer for Recovery Toolbox to add the software to Windows.
  3. Open the Recovery Toolbox window shown directly below.

    Recovery Toolbox for Project microsoft project won't open file

  4. Click the folder icon button to select an MPP file to repair.
  5. Press the Analyze button.
  6. Click the Yes button to confirm. The software will show users a preview of the recovered output.

    A recovered data preview microsoft project won't open file

  7. Then select the Start recovery option to fix the file.
  8. Click the Finish button.

3. Fix MPPs With Office Recovery

  1. Alternatively, users can fix corrupted MPP files with the Office Recovery web app, which usually charges $9.99 for fixed files. Open the Repair MS Project File page in a browser.

    The Repair MS Project File page microsoft project won't open file

  2. Click Choose file to select a MPP file to repair.
  3. Then press the Secure Upload and Repair button to fix the MPP.
  4. Select the Get the repaired file option.
  5. Users can then click a demo file title to download it.
  6. To get a fully fixed file, select the Purchase full recovery for $9.99 option.
  7. Thereafter, open the fixed MPP in Microsoft Project.

So, users might still be able to either recover previous MPP file versions or fix the corrupted files with third-party software. The Project Repair Kit is another third-party software utility for fixing MPP files that’s worth noting.