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I have never heard of a .US file extension, and I can't even find any reference to it through the web.
You could try simply renaming the file. Goto 'My Computer' and navigate through to the directory of where the file is. Then click 'Tools > Folder Options > View' and remove the tick next to 'Hide extensions for known file types'. Click apply then OK. Now left click on the video file that you want to rename, and press F2. Edit the file name so that it ends with a .AVI and then save it (for example video.AVI).
If this 'breaks' the file and it won't load anywhere, simply rename it back to what it originally was (presumably video.US).
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