How to open a mpp file? Whish s/w is suitable?

I think you need Microsoft project.

There are many free software to open a mpp file.

There are 5 solutions listed here on how to open a .mpp file without MS Project installed.

Yeah, there's lots of software available. Some offer comparability with Mac, Linux and obviously Windows.

I personally use these guys, they have a free demo available if you want to try:
Microsoft Project | Viewer | Steelray

Make use of following solution to open mpp files corrupt powerpoint fix software