xml) for any Microsoft Project version (2000, 20).Available views: WBS, Gantt chart, task. MOOS v.0.4 MOOS 0.4 brings convenience to users who desire a free Microsoft Project viewer which is able to open any MS Project file type (.mpp.RationalPlan Multi Project is a powerful project management software capable of handling multiple interrelated projects and covering project management areas starting with WBS construction, project planning and scheduling to progress tracking etc.