ITunes file in Preftech Folder Question

Hi, there. I hope someone can answer this.
Saturday morning, my virus software blocked a Trojan. I've run numerous scans with different recommended software and am assured by them all my system is clean.
But, of course, in any situation where my system may've been compromised, I get a little paranoid about weird changes occurring shortly thereafter.
Saturday night (after being certain everything was clean), I purchased something from iTunes and was asked to confirm my billing info. I searched for this issue on the forums and found that it seemed to be a common occurrence.
So, to make a long story even longer, my question:
Later that night, a file was added to my Preftech folder that says it opens with iTunes.
I've scanned that particular file as well and it comes back clean, but I'd really like some assurance that it is a legit file.
The name is:
MSIEXEC.EXE-330626DC.pf
I've Googled and Googled and can't get anything definite.
Does anyone know if this is a normal thing for iTunes to put in a Preftech folder? Am I just being paranoid or is it suspicious?
Thanks for any advice you can give me.
KJ

Sorry for wasting anyone's time.
I've discovered that it's not actually an iTunes file being added...but rather, everything in my prefetch folder has been changed to open with iTunes as its default application.

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