Reminder: Downgrading to QuickTime 7.3.x QuickTime 7.4 is causing so many serious problems for so many users (no video, only audio in movies, incompatibility with third-party applications, inability ...
CBS, Macs don't require an extension at all. The info is built into the file in the form of a resourse fork. They probably named it ".MooV" because they weren't sure how the naming convention worked ...