HT1349 Updated my operating system to Mountain Lion and iMovie will not play movies developed through the old iMovie HD program.  Any idea how to convert the movies or buy an app that will do that.

Having trouble converting iMovieHD to the new updated iMovie dowloaded with Mountain Lion.  Any ideas

Given the extreme limitations outlined in the article Allen linked to, and given thst iMovie HD 6 is known to work with Mountain Lion, you might be better served by installing iMovie 6 on your Mac.
You can still keep iMovie 11 as well:
Happily this is easily achieved, but it has to be done backwards.
Delete iMovie 11 (just drag it to the trash). Now install iMovie 6 from the iLife 6 install disks. Update it to iMovie 6.0.3.
Now re-install iMovie 11. This automatically moves iMovie 6 into a folder it creates in your Applications folder called iMovie Previous Version.
Then reinstall iMovie 11.
iMovie 6 works great with iDVD 7.
Now you have them both, and you can have both in the Dock as well.

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