Gifpress
From Just Solve the File Format Problem
Gifpress is a special-purpose file compression utility for DOS. It compresses only GIF image files, to its native .GPS format. It was developed by John Callicotte, and distributed as shareware.
A GPS file can be decompressed back to a GIF file that is functionally identical to the original, but not necessarily byte-for-byte identical.
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Format details
There's clear evidence that Gifpress uses the Cx data compression toolkit (v2.01) by Eugene Nelson and Four Lakes Computing (cx201e.zip).
Identification
It's not known how to identify a GPS file from its contents, though in limited testing, the bytes 0xff 0xb4 always appeared at offset 2.
