Based upon the details I can find in a couple Door Game source files from March 1996, there was a ZIP comment specification. It was plain 8bit ASCII, not embedded ANSI or AVATAR colors. The generator for a couple of these doors, generate a 78 column file, with up to 23 lines.
From one product I bought:
McSoft Corp. Presents
The Ultimate BattleShip Game!
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BATTLE SHIPS DELUXE V3.00 BETA