The Crystal Reports application is classified as a data management and reporting software for business-oriented purposes. These specific pieces of information associated with a Crystal Reports project are gathered and initialized by the application when a user opens an RPT file, so as for the user to view and make edits or modifications to the output file using the functionalities provided by the Crystal Reports program. rpt files contain specific project data entered by the user. Also commonly known as report files, these. Users of the Crystal Reports application save project output files in the RPT format. What is a rpt file and how do I open a rpt file?