THM File Format
In many cases, the way the thumbnail is associated with the main picture or video file is by having the same name, except for the file extension. Thus if the main video were called myvideo.avi, the corresponding thumbnail would be called myvideo.thm. One consequence of this, is that if either the main file, or the thumbnail, is renamed, the link between the two files will be broken.
Most often, thumbnails are actually stored in JPEG format, and as a result it may be possible to view thumbnails with standard JPEG viewing software - although in the case of some software, it may be necessary to rename the file with a .jpg file extension before doing so.
Please note: The word "thumbnail" refers to a general concept - that of storing/displaying reduced size versions of images - and although the THM format is one method of storing thumbnail data and images, it is not of course the only method.
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