Solved: http://www.microsoft.com/windows/windows-xp/

Open the .run file in a text editor (something that can handle big files) and find the line
that says "tail +6" and change it to "tail -n +6" - tail is probably used in multiple places in the script.

why not not be a retard and use sed?

The double negative seems very appropriate there. I agree, a retard would try to show off using sed.

Looks like some kinda RPG stat to me.

are you running 64bit?
if yes, prefix 'linux32'
alternativeley, try ioquake3.run