Yesterday I decided to uninstall Revit 2011 since we're only using 2012 and (mostly) 2013 now. After doing so, my machine lost the program association for what program to use to open RFA and RVT files. I double-clicked on a Revit file in Explorer and it brought up the window asking me to specify what program to open it with (all the while I had 2013 open and running).
So I navigated to the Revit 2013 EXE. Now, however, if I double click on any Revit file in Explorer, or if I download a Revit file and try to open it from Firefox, my machine will open a 2nd session of Revit 2013 instead of just opening the file in the 2013 instance I already have running.
Before I removed 2011 all Revit files would open up in 2013 just fine, if that's the Revit version I had open when double-clicking a Revit file or opening a Revit file from Firefox. Any ideas what has caused this and how to fix it? I'm sure it's some system registry entry somewhere that the 2011 uninstall process probably wiped out. I just don't understand why it keeps wanting to open a second instance of 2013.