What the hell is this?

Ok so I had just finished jailbreaking my iPhone 3g with 3.0 firmware....process was done, cydia was opened and reset.

Phone was sitting "off" but now powered down....screen black but phone plugged in to laptop.

iTunes was not running at all

I was in my GMAIL...I clicked I think "return to inbox" tried scrolling nothing happens....

next thing I know I have a prompt to download "iTunesIco.exe"

I get thousands upon thousands of Google results...but none of them are worth a crap nor provide any insight as to what it is, what it does...or better yet where it came from.