The "My Documents" folder on my desktop has had this thumbnail since I got my new computer.

(swedish)
It's the cover art of the Metal Gear Solid 2 OST.
I honestly have no idea why it's there. The only time I've ever used any of it is when I made an old Blockland video a couple of years ago, and I've removed every trace of the music files since then.
They were also the only MGS related files I've ever had on my computer, and somehow it's ended up as the thumbnail of the parent folder (the music files were inside a folder that was inside another folder in My Documents, which makes it even stranger)
Does anyone know why it's like this, and is there a way to fix it?