Thank you Alex. Both problems are solved. Getting V-vocal back was solved by re-installing X1 (though as you mentioned, I only needed to run the set-up), and getting my file associations are back by running the set-up only and X3e for X3 (as the default is the latest installation so now it points to X3 instead of X1.)
Here is Cj's advice to get V-vocal back:
You do not need to RE-INSTALL X1 to get X3 working again. Just re-install X3 again and those files will not be associated with X1. This is all written ion the read me' files your suppose to read before installing. You do not need X1 to have X3 working. Your running 50 miles, when you just need to walk 10 feet. So are you suggesting that CJ's advice is sound, and that I could have gotten V-vocal back just by reinstalling X3?
Thank you for the help.