"Firefox doesn't know how to open this address, because one of the following protocols (rrre) isn't associated with any program or is not allowed in this context. You might need to install other software to open this address." I installed Game in Steam. Tried to launch from DTM competition page. Then I tried the small "R3E_Setup.exe" and since Steam and RRRE were already installed it just took me to that page in my Steam Library.
ran game directly for first time. browser link now works (it asked me to select an application to use, which I have now done)