When I made a bat file for UT(unrealtournament), I had 20 fps more, then without the file. I've got a Intellimouse explorer and I have to install the drivers, if I wanted to use the the side buttons.
The bat file uses a lot of the cpu, so if i press in UT on the large side button(large size button is my rocketlauncher , it'll only work after 5 sec or something. If I play without the bat file, the mouse works fine, but UT doesn't work good at al then.
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UT Rocks!