Well, I did a little bit of research and it looks like PKZIP, the one you said is invented by Phil Katz, and ZLIB both use the same decompression algorithm (DEFLATE) but they have different headers so that might explain that.
I'll have to look into it further perhaps... What's one of the ROF's that contains a DEF'd file?
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I'LL GET MAH STABBIN KNIFE!
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