Finding Orphaned THM Files

I'm cleaning up my images, and apparently have a couple thousand .THM file which don't have corresponding .CRW files. A long time ago I must have used some software that didn't delete the THM file whenever I deleted a photo.

Does anyone know of a program that will identify and/or delete all these THMs that don't have corresponding CRWs?


If not, I will end up writing a Python script to do the job. I would match up the keeper by the filenames, and confirm identical creation dates. Any THMs left over would get deleted.

But I wouldn't mind going a little bit deeper just to be sure that I'm deleting true orphans.

Does anyone know of any information that is inside *both* the THM and CRW, something that would allow me to do a *positive* match for pairing the CRW with the THM?

Why keep the THMs file? I think it's just the thumbnail, right?
Can't you do without all of them entirely? (I'd test that first though )

Hmmm, I'm not sure. I may have to investigate THMs a bit more.


Looks like I shouldn't delete all THMs.

https://photography-on-the.net/forum/showthre​ad.php?t=460

THM files are from older Canon cameras, the 300D and 10D and such, before CR2. The cameras had a separate file to use to show the thumbnail on the back of the camera, whereas newer cameras have a jpeg embedded in the RAW. The THM file contains slightly more exif information, but the RAW still have exif embedded.

I would delete all THM files on your system, but first test that you can get all the exif information you need from the CRW without having a THM around.