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THM — Video Thumbnail
THM is a small JPEG thumbnail that Canon and other cameras save next to each video, showing its first frame.
When a camera records a video, it often writes a .thm file with the same name: a small JPEG preview (typically 160×120) used by the camera and by photo software.
Computers do not show THM files as images. Converting to JPG or PNG makes the preview viewable; it stays small.