Rehan ShaderTFX
Rehan ShaderTFX, also known just as ShaderTFX is a library of tools to build advanced plugins in Windows Movie Maker 6.0.
While being a paid program, it is no longer commercially available. As a result you must use an existing key or modify the registry to get it to work.
Rehan Plugins
These plugins come built-in with the software, or available on Rehan's website.