Just an FYI, never saw this in previous versions of AutoHotkey's compiled executables. The virus was added to AntiVir last year in August, so I'm pretty sure its a change in AutoHotkey.
The virus reported to be found is:
TR/AutoIt
This is with the latest free home version of AntiVir
http://www.free-av.com/I'm guessing that some specific byte code that AntiVir is using to identify the AutoIt Trojan is being identified in executables generated with the latest version of AutoHotKey. (Since AutoHotkey is an AutoIt derivative I believe, that makes some possible sense?)
For now I set an exception in AntiVir to not scan my AutoHotKey generated EXE files, but that always makes me nervous in case they did get infected with some other virus in the future.
Not sure if there's anything you can do about it, or if its something AntiVir has to adjust (or if you could help them with what they need to fix) but thought I'd post here as an FYI.