Primavera offers XML options compatible with Microsoft Project 2003, 2007 and 2010; MPP for Project 2003; and MPX for older versions of Project. Choose "Microsoft Project" as the file format.

Please help me to solve my problem with Microsoft Project 2010 (MP) I have created mpp format file in MP. Now when I try to open it get this error: "Project cannot recognize this file format".

Ecma, the international standards body accepted Microsoft's proposed Open XML File Format submission for standardization.