I believe you're referring to MOD files, just as the other poster suspected. "MOV" is just part of the file name. It's not the file type/extension. So, the files from your JVC camera are MPEG-2 files. They cannot be imported into the "Silver" version of Movie Edit Pro, as it doesn't support MPEG-2 handling. You'd need the classic or "Plus" version of the program for that:
If you're really referring to *.MOV files, these are Apple Quicktime files. You'd need to install the Apple Quicktime player including the associated codecs for this to work: