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.

A couple of weeks ago, ISO members voted to make Microsoft's Office Open XML format an official standard. The vote was not without its share of controversy, but it's a done deal and now the world ...

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