How do you get it to work with Windows XP? It just says (NOTE: This is for this and other Q3 games) "COuld not load OpenGL subsystem."

Make sure you have the latest drivers for your vid card. And make sure you have the latest XP service pack. Un install EF and the Xpansion pak and then reinstall it. Hopefully you will be ok. I had a similar problem with XP until I did the above.:D

Re: Brightness...
 

How?

the "Could not load OpenGL subsystem" error is because the graphics drivers supplied with XP don't support OpenGL. usually a simple graphics driver update will fix the problem


the HM brightness not being changeable is fixed by using the following commands

\r_ignorehwgamma 1
\r_overBrightBits 0

and can be reversed by simply changing to this

\r_ignorehwgamma 0
\r_overBrightBits 1

this should work on all q3 based games

however the colours can look slightly washed out when you do this

what graphics card are you using, becuase i have XP to and mine works just fine.

OK, heres the problem. When you use windows XP it install microsoft made generic drivers for your video card. Since microsoft uses is monopoly unfairly, it only installs directx libraries with those drivers because microsoft wants to kill opengl since its a competing technology to directx. SO all you have to do is go to your manufacters websitr and download drivers made by the company that made the graphics card. When you install there dirver yu will not only ge both a driectx and opengl drivers but you wil also get a performance boost since its drivers made specifically for your card.