These transitions require the use of Rehan's ShaderTFX add-on. If you've never installed this before, follow the directions on his website and test they work first. If you've already installed a copy of ShaderTFX (registered or unregistered), you can skip these steps. After restarting Windows Movie Maker, you should have 28 new Twist transitions with corresponding icons. There are 4 twist directions and 7 different background colors.

*Note: These transitions require the architecture of WMM 6.0 and can't be made to work on the earlier WMM 2.6 or the later WLMM. For anyone that wants to customize the background color, check the .xml.