system
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If it a 30MB file i can only suggest that you post the link to the file download here and PM one of the Avast team so they know of its presents (Igor or Pavel should be fine to PM), they could download and analyse it that way then.
its all a bit confusing that other AV products detect nothing yet Avast found something, and I don't know what to do
Its most likely a false positive, which means avast is detecting it as a virus when it really isn’t, unfourtunately it can happy sometimes in Avti-virus programs, but if the avast team analyses and finds it to be a false positive it will be fixed by the next VPS update.
–lee