Download and run the .reg file, install in your Windows Registry and enjoy of the extra settings that will become available in your ForceWare drivers panel.

Coolbits adds additional support for mobile systems, enables the Direct3d and OpenGL configuration tabs, and even more tweaking capability from the nVidia taskbar settings panel. It unlocks many extra options in the control panel/driver, including but not limited to - overclocking, agp & hardware settings, fan control, troubleshooting dialog, and openGL 2.0 support!

*NOTE: This tweak is intended for use with GeForce cards and Forceware 55.xx - 6x.xx drivers. Coolbits is not fully compatible with Windows 98/Me or driver versions older than 55.xx. If you do happen to run this tweak with older software, you could get errors at startup! To enable full compatibility, you must disable the options that are causing issues with your current setup. If you experience any minor problems, simply reinstall/update your display driver.

FAQ (Thanks to nvnews forum):

Q. I dont see the temperature settings, is this due to my card?
A. The temp settings panel is only available with cards equipped with thermal sensors. Some cards that I know of have temp sensors are 5700U, 5800U, 5950U, and 6800GT/U. But really it all comes down to the manufacturer. I have seen some 5700 and 5900 without temp sensor, but mainly the cheaper XT/LX/SE versions.

Q. The Fan always on doesn't seem to work.
A. The 'fan always on' option is for cards with the OTES (i.e. 5800U) or similar cooling system in which shuts off in 2d mode. It will force fan on even in 2D mode. Of course this means the fans on the hs/f be designed such a way that this option can work.

Q. I thought it enabled Opengl 2.0? It doesn't though.
A. OpenGL Shading Language 2.0 can only be enabled on 55.xx and higher Forceware drivers. It had not yet been implemented in older Detonator or pre 55 Forceware drivers. 6x.xx drivers are GLSL ready, so these lines aren't absolutely necessary. They can be commented out with a semicolon ';' if issues become apparent in future driver versions.

Q. What happened to advanced options and application profiles for my GeForce FX/6?
A. The Application Profiles page has been disabled to allow for OpenGL and Direct3d options. Unfortunately, there is currently no way to enable all the OpenGL/Direct3D/App Profile/Advanced Option pages simultaneously. However, you can re-enable the application profiles page by changing its respective value to 1 in the coolbits file. See Clay's post for further instructions that include screenshots.

Q. Is my 6800 ULTRA capable of 16x AF? I only see 8x maximum within the Performance and Quality settings of the drivers?
A. Yes, the 6800 supports 16x AF. To select it, simply choose 16x AF from the taskbar icon. Or, if you prefer to have the options within the control panel, re-enable the application profile page.