No, it cannot be used by a virus to attack your computer, unless the virus wrote a file in there [NOT a .pf file] and then called it from some other location. If a virus process or a trojan once ran then xp would create a prefetch file for it so that next time it was run it would load more quickly! Heh. But the .pf file on its own is benign. If you feel uncomfortable about it you can just delete that file.....
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