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by whoopdedo 939 days ago
Not listed was a clever encoding for MS-DOS files, XXBUG[1]. DOS had a rudimentary debugger and memory editor. (It even stuck around all the way to Windows XP but didn't survive the transition to 64-bit.) Because it had the ability to write to disk you could convert any file to hexadecimal bytes and sprinkle some control commands about to create a script for DEBUG.EXE. The text-encoded file could then be sent anywhere without needing to download a decoder program first.

[1] http://justsolve.archiveteam.org/wiki/XXBUG