​​If you have issue opening a .mpp file you might be in one of the following cases:
1. You are trying to open a newer MS Project mpp file with an older version of our app.
2. You may have a corrupt mpp file.
3. There may be a bug in our system.

Please make sure you have installed, on your device, our latest application from the store or from our website: https://www.projectplan365.com/download.

If your issue is not solved, please contact us at https://www.projectplan365.com/newticket/index