first of all is your windows partition fat32 or NTFS. If its ntfs then I don't know what to do but if its a fat partion I can help. You have to add a line to /etc/fstab similar to this.
/dev/hda1 * * * * * * * /home/daniel/Windows * *vfat * defaults,uid=500,gid=500 0 0
/dev/hda1 is the partition that windows is on. /home/daniel/Windows is where I mount the windows parition. I like to mount it in the home directory but I usually see it in /mnt/win. vfat indicates that its a fat partition. Then the defaults part are the options and uid 500 is my user so I have permission to read and write to the windows partition. I'm not sure what the last 0 0 is for though
I use redhat so I get the quake 3 binaries from freshrpms.net and install that. Then its as simple as ln -s /usr/games/quake3/baseq3/pak0.pk3 /whever/windows/is/mount/and/location/of/pak0.pk3 in windows