BleepingComputer.com: Can someone tell me what's going on?

I've always had issues with the shortcut symbol switching out for other system icons, such as Adobe Imageready or Photoshop icons. However, this was slightly weirder. I created a batch file that does absolutely nothing (It just looks like it's generating code, but it's just pinging the localhost a few times) to screencapture and create a background for video. However, I decided to tweak it, so without closing the batch file (stupid, I know) I edited it in notepad and saved it.

Next thing I know, the logo from Portal has attached itself to the batch file's icon. I don't know if that game's logo was based off of some Windows function or something, but I don't have any copies of the game, actual or downloaded.

I'm running Windows Vista SP2, and I've attached a screenshot. Can anyone tell me what's going on?
Stupid question, I know.