The server portion of the software leaves a port wide open and there is software out there that crawls the web, interrogates your pc and is able to send anything on your disk back to the originator. It has nothing to do with downloading or running anything. Firewalls or security software cant stop it because it is data passing through a port that you opened up. Just installing the P2P software makes your data vulnerable.
Alll P2P file sharing software has the same vulnerabilities.
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