I created a .wmv file with Windows Live Movie Maker and tried to add that .wmv file into a different project. It displays the frame with an exclamation mark in the middle. When I click on it, it says:
"Do you want to remove "Intro.wmv" from the project?
The file might be corrupted or in a format that Movie Maker doesn't recognize.
This movie can't be saved or published until Intro.wmv is removed from the project.
I've tried saving it with various display settings and sizes, yet it always says the same thing when I try to add it to a different project. I can add .mp4 files from my phone just fine. I thought it might be a Codec problem, but how can that be, if I'm using the EXACT SAME program that I just saved it with?