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Make sure the MediaBrowser is directed to a file on your computer, not to the camera... which it may not be able to get data from at sufficient speed, or other difficulties.
Look at the file on the computer that you are trying to play-back: What is its File Type? and is its size reasonably large?
Try a different media player to play back the file... such as Windows Media Player. What result do you get? or does WMP play the file OK, but not MediaBrowser ?
5.5 KB is rather small for a video file, that's practically empty of content. No wonder there if it doesn't play back on anything.
But the larger ones are normal enough in point of size.
The WMP results aren't strange. MOI and MOD would be found exotic and unplayable by it, unless it had the proper plug-in for those files added to it, I think.
I don't know much about JVC MediaBrowser, as opposed to Canon. If you like, I will give up this case - but, I need to look up the MOI and MOD file types, first.
I have Opted Out, opening the case to other Experts, with attention to one who can solve a
question or issue.