Those .MOD files can be a pain to work with and convert properly. I used to have one for use in the classroom and the easiest, though not the fastest, way to convert the files was to use the software that came bundled with the camera. If I am not mistaken I believe it was PowerDirector. There was some program included that would transfer and convert the video from the HDD of the camcorder. Have you tried changing the extension to something like .AVI or .MPG or .MP4 or some other extension? What is the model number of the camcorder?