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Instead of Adobe Systems porting Photoshop to OS/2, SPG created ColorWorks (which served the same purpose).
Anyways, why is ColorWorks by SPG so rare!?
First off, probably the fact it's only for OS/2. They eventually switched to making extensions to the established photo manipulation products like Photoshop and PSP (and ultimately switching to Windows)
Anyway I found a demo for version 1:
Sadly, I'm looking for the full versions.