If it is indeed a false positive, add it to the exclusions lists (Standard Shield, Customize, Advanced and Program Settings, Exclusions) and check scan it periodically using the ashQuick scan (right click scan, it will need to be temporarily removed from the standard shield exclusions otherwise it won’t be scanned), when it is no longer detected then you can also remove it from the program settings, exclusions.
Also see (Mini Sticky) False Positives, how to report and what to do to exclude them until the problem is corrected.