Another possibility is that they have the hide extensions for known file types enabled which is a default with Windows, one of the first thing I change on a new install.
If it really doesn't have an extension, the video player will look at the file header and see that it is a media file and determine what kind and play it whether it has an extension or not.
Another possibility is that they have the hide extensions for known file types enabled which is a default with Windows, one of the first thing I change on a new install.
If it really doesn't have an extension, the video player will look at the file header and see that it is a media file and determine what kind and play it whether it has an extension or not.