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Hi - this is crazy. I have 80 mp4 video's from a scuba trip using a gopro. I took each mp4 file, opened it up in movie maker, edited it, then saved EACH as a project file (using same name as mp4) once edited (wlmp). 

I did this so I have each file edited/trimmed down, so that I can then create one new collective movie./project file in MM. When I go back to open the wlmp files, it says "movie maker does not support.." Kidding me? It's a movie maker file. I tried dragging/dropping, and opening new project. When I select the wlmp file and select "open with movie maker", it does load in movie maker. Great, but that is only one of 80 files. When I try to "add" the additional files (select all, etc), I get the error message. Should I not have edited each file in movie maker? Should I have put them all into one collective file from mp4's, then edited in movie maker project file? This is crazy to me. I spent hours and hours doing this, IN MOVIE MAKER and saving them as MOVIE MAKER PROJECT FILES (wlmp). What gives?

Note that I have created movies with movie maker without problem in the past. I researched and came up with potential "missing codecs"? But every fix I see does not work for me. Suprised there is not a msft tool that tells you if you have or what is missing. 

I have re-installed movie maker (I'm working with windows 8.1 and only had the computer for 7 months so everything is fairly new).

Note: I have been receiving some weird pop-ups saying "....contact msft support". I did research on this and it is not a virus, but a pop-up that is solely related to your browser (I use chrome). I also have AVG and Adaware installed. As a result of this, I went and uninstalled any unknown application that had been installed within the last few days. THIS is the reason I'm wondering if I uninstalled a codec file by accident - that is separate but dependent for MSFT Movie Maker files?

Frustrated...any help greatly appreciated.