FOUND IT!!
After months of researches, I finally found out what went wrong:
The Avast! antivirus prevents autoIT exes from creating files outside of exception paths!
Its 100% my fault, I forgot rule #1: check the antivirus
It took me so long because Avast kept quiet, it didnt say anything, and even the gui doesnt show me any kind of warning or recently blocked programs..
Anyway thanks to y...
Thanks to the forum creators for keeping this awesome language alive, and take care everybody
yhu420's post in Autoit wont always create file, with safe content was marked as the answer