There is only one file type that uses the .XRP extension:
RationalPlan Project File
Project created with RationalPlan project management software; used for tracking project-related data, such as resources, workload, costs, and budget management; may be as a Single Project or a Multi Project file (created with RationalPlan Multi Project).
XRP files may be created with RationalPlan Single Project or Multi Project and can be viewed with the free RationalPlan Project Viewer.
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Updated: January 27, 2009