Best way is upload it here>>http://www.virustotal.com/, but if the file system shield detects it, it will throw it right back in the chest as soon as you try to pull it out, so this means you need to temporarily set an exclusion for it.

If you do not care to take it that far, Avast! is very fast about clearing up FPs, so just leave it in the chest and re-scan it after one or two new definition updates. You can also submit a file to Avast! as a FP directly from the chest by right-clicking.