Mr Uher, thx for trying to help but the link you provided has several different "SAP Crystal Solutions". I assumed you wanted me to install "SAP Crystal Presentation Design 2011" so I installed it. Unfortunately this app only works with files of type "xlf" "Dashboards and Presentation Design Files" so I could not open the "rpt" file using this app.
Fortunately I found this post: http://stackoverflow.com/questions/10501042/cannot-open-rpt-crystal-reports-file-in-visual-studio-2010 as recommended, I installed the
SAP Crystal Reports, version for Visual Studio 2010 - Standard
Once I installed that, I was able to open the "rpt" files withing Visual Studio and I can edit them as well and I am a happy man.