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I'm not sure I understand the JPG+RAR notation. I assume they didn't just rename file extensions or whatever? (sorry, google very unhelpful here unsurprisingl

• shaky-carrousel 4y ago
  It's relatively easy, the JPG format specifies the length of the file, so you can append anything at the end of the file and it will get ignored. I appended an erotica JPG at the end of an innocent looking one. They probably appended a RAR.