[Q] Clockworkmod file in root of sdcard topic

I have a clockworkmod file in the root of sdcard. I can see it in ES File Explorer but I cannot see it when I connect the phone to my computer. I use clockworkmod recovery only by booting into it when I need to...not by flashing it.

Although it dissappears when I delete it in ES File Explorer, if I refresh the screen it is still there. Anyone know what this file is exactly and how to get rid of it for good?