Is it there a way somehow Movie Maker 3 to be back ported from LH 4093 main to LH 4074?

Use Dependency Walker and see what it depends on, then backport those files too. Though it's probably not going to work...

It's based on Avalon, so you need .NET 2.0 beta build from 4093.

Should be possible, but it's way too hard porting Avalon from 4093 (as there weren't any SDKs) to 4074.

Try swapping needed runtime libraries after dependency testing.