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Mr Khan said:

I'd be intrigued to know how, unless it can just isolate multimedia files, images, RAR, and ZIP files

Compressed files such as .zip can easily be scanned. Easiest example is a virus scanner, it can see what's in the compressed file.

For images, they probably use some sort of image recognition. I.E. cameras can tell where and how many faces there are and auto focus for you.