[euroclear]

Caldera Linux included Looking Glass[1] which was vaguely Windows-like and commercial. Not sure if that's what you were thinking of.

[1] https://en.wikipedia.org/wiki/Looking_Glass_(UNIX_desktop)

[squarefoot]

Doesn't look that different from Motif/CDE, they were ubiquitous back in the day.

https://en.wikipedia.org/wiki/Common_Desktop_Environment

https://en.wikipedia.org/wiki/Motif_(software)

[badsectoracula]

Yes, Looking Glass is what i had in mind though i think i remembered it closer to the screenshot shown in this post:

https://www.reddit.com/r/vintageunix/comments/ch3xl1/caldera...