Our mainclient.exe is, obviously, malware free. Scanners with comprehensive heuristics sometimes return false positives. John from our development team ran the mainclient.exe through a site that uses multiple antivirus scanners to scan a certain file that you upload. The site can be found at: http://virusscan.jotti.org/
Out of all the antivirus software, only NOD32 returned the result stating that it was a “probable variant”. Cases like these show that you can’t rely on a single antivirus software.
I hope this helps,
Marce