Hi MrBabis,
False positives could be a pain in the neck, well in the case of an online scanner that starts to delete false positives right away.
Whenever you are flagged that you have a suspicious file or even a virus alert, you should get informed about the infection before you make an informed decision, that means scan a second time,
make a notepad file with all that is found in these exact wordings,
take a search out on the net and in a virus encyclopedia to see
what you have at hand, and update the file to Jotti or Virustotal to see whether other virusscanners come with a positive also (may it be under another name). If you are sure you have met a false positive, you should forward this like adviced to the AV-vendor to be analyzed anew. We in the forum like to hear on FP's too like Bob3160 says, but it is also important to inform the developer of the file at hand that a FP was found there. If he is a trusted party he is entitled to get a friendly e-mail also.
I must admit that AV-scanner have different attitudes to flagging suspicious files. Some even flag joke files, because they reason it can startle the end-user, so an animated file that threats to f-disk you, is flagged as a joke.file virus and considered to be deleted, while it is still quite harmless computer-wise. Then there are more FPs when you scan heuristically. So always seek a second opinion.
polonus