The Sleeping Giant's Sea Lion

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4
votes
2answers
1k views

What are THM files in Canon SD Card

I have a Canon 550D and I have a THM for each picture that I have taken in my SD Card. What is a THM file and what is it used for?
5
votes
1answer
39k views

What is the CTG file in Canon SD card?

I have a Canon 550D and in the SD Card I found a file \DCIM\CANONMSC\M0205.CTG What is this file used for?