MS Project can't recognize this file format...

Question

At work, I still have Project 98. When I try to open
an .mpp file, the following message appears:
"Microsoft Project cannot recognize this file format.
Do you want to open this file as text only?"
I've been assured it has been saved "down" to Project 98,
and in the Windows Explorer, it shows it is saved as .mpp;
Microsoft Project 8.0 Project. A user who has the Office
XP version states he's receiving the same message.
Can anything be done to restore this file?

Answer 1

MPP Repair Kit is a project management tool created by Microsoft and included in the MS Office suite. This tool can repair corrupted Microsoft Project (MPP) files and recover their content, or recover these
files altogether when they were lost, deleted or damaged because of various reasons.
Link to download its demo version:
http://www.mpp.repair/
OR ALTERNATIVE ACTIONS
Do the following:
1. Launch Microsoft Project Professional and log into Project Server
2. Open the project in question
3. Click File – Save As – Save As File
4. Save the project as an .mpp file
5. Log into PWA with administrator permissions
6. Click Admin – Clean Up Project Server Database
7. Delete the project and its associated SharePoint subweb
On the new Project Server instance, do the following:
1. Launch Microsoft Project Professional and log into Project Server
2. Click Tools – Enterprise Options – Import Project to Enterprise
3. Import the project
4. Click Collaborate – Publish – All Information
5. Click Collaborate – Publish – Republish Assignments
6. Select the “Overwrite actual work entered by resources” option
7. Click OK
Visit next source:-
http://www.filerepairforum.com/forum/microsoft/microsoft-aa/project/106-%E2%80%8Bproject-files-keep-getting-corrupted-and-i-can-t-open
Hope this helps.