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A friend of mine has a collection of .jpg that cannot be opened because they start with 0xAD 0xE1 (so says GIMP).

Any idea which file format these may be?

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A quick look here doesn't show that sequence. Try running the file command on your file to see what it thinks (assuming you're on Linux). –  Chris Jun 27 '11 at 21:24
    
@Chris On Linux, the command file returns with the result: data. –  WinWin Jun 27 '11 at 21:30
    
Do you have more context info (Mac? Machine word order? taken from SD card in game console? Stuff like that) if you upload it somewhere I might take a stab at guessing the origin –  sehe Jun 27 '11 at 21:52
    
Yup, TrID also returns nothing (useful). Are those the only two bytes the files have in common or are there any more (is the third byte different)? –  Synetech Jun 30 '11 at 1:44
    
What's the next 20-30 bytes of the file. –  Ian Boyd Jun 30 '11 at 3:06
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2 Answers

up vote 2 down vote accepted

It might be the FEE1DEAD code used by Linux reboot() syscall.

FEE1DEAD Used by Linux reboot() syscall Seen in PowerPC Mach-O binaries on Apple Inc.‘s Mac OS X platform.

That is, on a machine with suitably swapped byte order, 0xAD 0xE1 might be read in that order

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gotta give you one for creativity. –  Chris Jun 27 '11 at 21:55
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These definitely aren't jpg image formats or any common image format for that matter... I think a better question to ask is where your friend got these images or how he created them?

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Heck, digging further it seems that it isn't any common file header if we can trust this link: garykessler.net/library/file_sigs.html –  TheCapn Jun 27 '11 at 21:30
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