There is a unix utility called "file". It reads the file information, not extension, and reports on the file that is uploaded. I use it on my freehost. Example: gzip file copied to a .jpg returns the result:
test.jpg: gzip compressed data, deflated, last modified: Thu May 9 02:45:59 2002, os: Unix
Sounds like these are actual images. Thats a new one by me.
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