From Project menu, Import project... , can be imported projects from following file types:
RationalPlan Single Project or Multi Project (.xrp)
Microsoft Project (.mpp)
Microsoft Project (.xml)
Microsoft Project template (.mpt)
Microsoft Project (.mpx)
The imported project or projects will be added below the existing ones in the current file.
From Project menu, Export project... , a project will be exported to the following format files:
RationalPlan Single Project (.xrp)
Microsoft Project (.xml)