I haven't used AutoIt but was it that or another tool with a similar name that: creates executables that are stand alone?
The main program doesn't need to be installed so they must be proper compiled binaries...
Auto-it produces executables which are scripts accompanied by a runtime script execution engine. The produced executable can be compressed using UPX and also the embedded script can be obfuscated, but it is always there. It is what gets executed. One of the strictest rules of the Auto-it discussion forum is "No. discussion of decompilers"