Sometimes I create project in MS Project 2016. Last project opened with error - The file cannot be opened. I tried to apply microsoft project repair tool, but it was useless. Please, any help.
10 reliable steps and your ms project file must be restored, another way you can try
https://www.repairtoolbox.com/projectrepair.html Project Repair Toolbox
1. Open a new blank project file
2. Go to Insert/Project and insert the problem file.
3. Select the first task which will be the insertion point summary line.
4. Go to Project/Task Information/Advanced tab.
5. Uncheck the "Link to Project" button and hit "OK".
6. If the file isn't already expanded, expand it.
7. Select all tasks below the top level summary line.
8. Outdent the selected tasks.
9. Delete the first task which previously was a summary line.
10. Save the resulting file.