HOLY CRAP! I did it! (well really the guys at Kubuntu and Wine...)
I got OP running on Linux! I only got two screenshots so far, setup and the CD Key prompt. Not surprisingly the same kind of tricks to setting up OP under Wine on Linux are similar to the usual issues on windows.
Long story short -
Kubuntu 7.04 (I like KDE better + K3b, Amorak... etc), I used the built in Adept package manager to install firefox and wine (0.9.45 I think it was) Make adjustments to wine in kubuntu's system setting applet if needed, though the default should be fine to start. First I tried Deus Ex, it ran pretty much out of the box, I was amazed. On to OP... install from CD no problem. Installed the patch,,. no problem, installed OP+4 with models, no problem... Many crashes and lockups later I find the shortcuts need to be edited with the working directory much as in windows, Tried hardware 3D with no luck, I installed DirectX 8.1NT in my Wine install (I know...), still no hardware, but ran the OP Setup utility (which needed the shortcut fix) to set it to software rendering at 800x600 and wow, it ran! I gleefully I entered my CD key and watched in awe as a D7 killed my CA in a quick skirmish.
(Oh yeah, i had to set my desktop to 16 bit color my manually editing /etc/X11/xorg.conf and restarting, as some of the wine debug output indicated an inability to change it through its directx interfaces.)
It was a litte choppy, but by computer is a little old... this would probably work better on a newer machine. I'll post the screenshots I have and try to get it running windowed for better demo screenshots.
I'll post more detailed and organised instructions later, I'd like to see this duplicated.
More soon... would be nice to see hardware 3D... I have an old card, might make a difference.