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And I found this elsewhere and it worked for my widescreen LCD

To make Quake 3 widescreen :

Edit q3config.cfg (preferably with textpad) and edit these lines:

seta r_mode "x"
Set this to -1....

Thanks, that worked !

Specifically :

If you can't install Quake 3 Arena on Windows 7 =

Copy the CD contents to your hard drive in a temp folder

Go to the directory "baseq3" and open...