File Extension RPT
File extension RPT used by SAP Crystal Reports to store report files. Crystal Reports started as a general use reporting application and grew into full scale business intelligence application targeted at small businesses. Files with file extension RPT could be viewed with SAP Crystal Reports or SAP Crystal Reports Viewer applications. Crystal Reports Viewer is available both on Windows and Mac OS.
RPT file format is not readable via text editor and should be opened only by application designed to open RPT files. Typically RPT files refer to data source which provides data for reports. Data source could be XML file, database connection, OLAP, Web Services, Salesforce.com driver, legacy and enterprise data sources.
RPT files could also be generated by Visual Studio or Borland Delphi since Crystal Reports were integrated to these development suites. Corresponding RPT files could be opened via these applications.
If you just want to view RPT file the best way to go is to yes SAP Crystal Reports Viewers. It is a free application from SAP which can view any RPT file produced by SAP Crystal Reports. SAP Crystal Reports application costs $495 per user and is only needed if you want to produce reports.