No longer recognising DV files

I'm using Final Cut Pro 4.5 on Mac OS X 10.4.2. I've got a single Final Cut Pro project with around 12 hours of DV footage. All of the clips are stored on an external LaCie FW800 500GB drive, formatted in FAT32. I have another, identical drive, formatted in HFS+, which I use for my backup.
Recently, the FAT32 drive started having problems, so I checked the drive for errors (under Windows) and most things seemed to be fine. However, one of the 12 folders containing about 12GB of DV clips became scrambled and could no longer be read. All other 11 folders were fine.
No problem, I thought, I'll just copy over the backed up files from the HFS+ drive to the FAT32 drive and start editing again. However, when I did this, Final Cut Pro started up with the very helpful "General Error (34)" whenever I tried opening this project. I narrowed the problem down to the backed up clips that I had. Having looked on the FAT32 drive, all of the DV clips are now listed in the Finder as "UNIX Executable File", with the corresponding black icon. The files will no longer open in FCP or iMovie 5. Quicktime won't open them, complaining that it doesn't recognise the file format.
In addition, ALL the backed up versions of the clips show this problem! While the DV clips on the FAT32 drive for the other 11 folders show up correctly, and will open in any of the above programs, the backed-up versions on the HFS+ drive all show up as "UNIX Executable File" and will not open. This means my backup is currently completely useless!
Is there any way I can recover these files? The files themselves seem intact, and the backup versions were created almost as soon as I'd imported the original clips, so they should be fine. It's just that they're no longer recognised as DV clips, so I'm stuck.
Also, am I causing myself problems by using the FAT32 disk as my primary scratch disk, as well as containing all the DV files?
Finally, is there a way to back these files up so that the file type is retained? I'd like to think that the backed up versions were actually backups!
Simon.

Right, finally cracked it. Based on my limited knowledge of Mac file structures, I wondered if the problem was caused by using 'rsync' for my original backups. It appears that the problem arose because however I had backed up the files hadn't retained the type and creator codes for the DV clips in question. I downloaded the utility 'FileType', which allowed me to set the file and creator codes for the 'broken' DV clips, set them all to match the good files, and lo and behold my FCP project was working again!
I then copied all the DV clips over to my HFS+ backup disk by hand (very laborious) and started digging about for problems with the backup. It turns out that 'rsync' doesn't support Mac OS X type and creator codes (which also explained why I had a whole range of "._" files floating around - apparently these contain the file/creator codes), which meant that all this information was stripped off when I ran the backup. Hence FCP (and Quicktime) could no longer recognise my DV clips.
I shall now have to find another method of doing my backups. But for now: success!
Simon.

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