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What type of file is this?

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I've recently found a flash drive that I haven't seen in a couple years, and there was a folder full of files with no extensions. They were all 'created' on the same day within a few hours according to windows. I've noticed a pattern with them though. There's 13 numbers, then the next file is the same 13 numbers, plus _m, then the next is the same 13 plus _t. The files without underscores are all multiple MB, but the _m is 1-7 kb and the _t is usually 10-20 kb. I originally thought they were pictures, because they were all made the same day, and they all start with the same 6 numbers. But I've tried jpg, bmp, tif and they haven't worked. I've tried mpg, mk4, flv, and mov and none worked. When I tried flv in VLC, it gave me an error about undf, but I don't know what that is (google says it's undefined?). I don't expect to ever have an answer, but it's driving me nuts. I thought maybe someone might recognize the file pattern.

1274745715043------3552 KB
1274745715043_m-------2 KB
1274745715043_t------10 KB

and so on. Thanks to anyone who responds
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