A friend asked me to post this here:

Windows Quake4 Server Fix

Linux Quake4 clients can only connect to Linux servers. This is because the Windows dedicated servers lack “game100.pk4". It’s an easy fix for server admins, all you have to do is to get the file from here:

game100.pk4
md5sum: 61513eab61e80621c5337bc1a309af01

and put it into your server's q4base directory.

Happy fraggin!

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[yi] it'd be nice to make server admins aware of it
[yi] so i can play on the other 80% of servers :)