For Vista, TV Pack and Windows 7
More information HERE
A couple of big new features.
- Take Ownership: To work round the issues with codecs being secure in Windows 7 and in some versions of Vista with TV Pack installed this option will take ownership of the default codec files and rename them to a .mcdu.bak file if you choose a non-standard codec If you then choose to go back to the standard decoders the utility will rename them back..
WARNING CHANGING THE DEFAULT MICROSOFT CODEC FOR LIVE TV CAN BREAK OTHER APPLICATIONS. RECOMMENDED ONLY FOR A PURELY MEDIA CENTER SETUP
- Show decoders not named video or audio. By default MCDU will show all codecs that have Video Decoder or Audio Decoder in the title – even if they are not marked as Media Center decoders. By checking this option al other decoders will be included. Use at your own risk.
If you are running Windows 7 Take Ownership will be checked at start up.

IMPORTANT IF YOU HAVE ALREADY RENAMED THE DEFAULT MICROSOF CODEC FILES THEN THE AUTO RENAMING WILL NOT WORK. RENAME THEM BACK BEFORE USING THE UTILITY.
And finally the holy grail…. FFDSHOW being used for live tv in 7 Media Center. To get FFDShow to recognise Live TV you will need to enable the MPEG in AVI option.