Suspicious confirm window

I have been copying files from the hard disk to Flash disks and external hard drives and I noticed this message:



While it may not look harmful, I'm quite suspicious about it since this message appears everytime I press "Yes" and a lot of files that I copy seem to be having such extra information. But this only happens while copying one disk to a different disk not on the same volume.

I have already scanned these files for viruses and there has been no report of an infection. Any idea what this may be?

Jam it back in, in the dark.

Ah, I see. Yes, I actually saw that Flash drives are FAT.

I thought there was something fishy about it. I'm relieved.

There's nowhere I can't reach.