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THM File Format

Thumbnail image file (Microsoft Clip Gallery v.1.x)

THM file format

THM is an image file format for thumbnails. Images are made smaller for browsing purposes, usually because it is easier to view and takes less time to load. THM files can be viewed by most image preview or editing programs on both Macs and PCs. THM files are similar to .JPEG files, and those .THM files representing image files can usually be converted to JPEG format by changing the name of the file from .THM to .JPEG or .JPG. THM files can also be used by videos. When extracting a video file from a camcorder, a thumbnail will be created to represent the video, usually taken from the video’s first frame. The .THM file will then have the same name as the .AVI file that it represents. With Canon-created video files, the .THM file also contains the metadata for the video, and therefore needs to remain with and have the same name as the .AVI file.

MIME: image/thm

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This was last updated in July 2010
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Great helpful answer thanks. It tells me everything I need to know about .THM files. Honestly, the best answer I've every found to something like this that I've googled. Simply and clearly explained. Thanks again!
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Saw a bunch of .THM files as I was exporting the photos and videos from my wife's camera. These .THM files match all the videos, which are in .MOV format.
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Have often wondered what these extra files were next to my photos/videos. When trying to open was always pointed to the web by windows but nothing ever came back to open these files. Now trying to download from my windows phone to my windows computer I have come across the same problem. Your explanation has now cleared up the mystery (even though I see I will have to change the file extension to view these files). Will not bother as the photos/videos are there anyway.
Thanks for the explantion. Simple and to the point.
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None of my THM files can be opened on my MacBook Air, yet when I google "Can I erase the THM files" it says I shouldn't. I have erased many of them already. I can't see the difference in the video I have left.

I don't understand how to open the THM file and why I'm told to keep them...what am I missing?
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Windows7 message seen when playing Canon Mvx35i camcorder "card" video

"Windows Media Player cannot play, burn, rip, or sync the file because a required audio codec is not installed on your computer"

Loaded Microsoft codec camera package; does not work.

Loaded Cole Williams mp4 file download, contains bugs, unistalled, Beware.

So what do I do to play these card videos, i.e.  Step 1....step2...step 3...in simple easily understood terms please?

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