I downloaded it from your link and tried it.
First the bad news: so far I haven't had luck with the archive. FCPX's Import window does see the archive when I click "Open Archive" and navigate to it, and even 'mounts' it as a camera under the camera list, and even has the "Import All" button lit, and will go thru the motions of an import, but it never let me see the contents, so nothing got imported. Tried 3 or 4 different times, and tried renaming the archive back to "NO NAME" like on the card, and even tried using FCPX to create it's own archive of it, which it seemed to do, but again, nothing would import from it.
The good news is, the MP4 you had in there imported into the media browser perfectly, and plays in the timeline just fine, with the audio. Reports it as a 59.94fps clip. If I apply an effect to it, it has an orange bar over it, plays in realtime while the effect renders in the background, then the bar goes away. So the MP4 file works like a charm.
I'd be happy if someone else tries the archive though, just to be sure.
FYI, I'm on a late 2010 iMac i7, OX 10.6.7.