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If you scroll down the page Mary posted...you
will see that .thm is an extension used for
certain thumbnail files. I wonder if your friend
somehow managed to send you the thumbnails
instead of the actual files?
I have read that you can change the .thm extension
to .jpg and view the file. I don't know if it works but
may be worth a try.
Also... the apps at the following links are supposed
to be compatible with .thm files.
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