I am looking for a program to recomend to Mac users to open 7z and NSIS exe's, so is this able to open exe files created with NSIS?
I think it is, as it uses p7zip (port of 7-zip) and I think it can. Just point me to a NSIS file and I'll tell you.
Just tested. I've extracted the Nullsoft Scriptable Install System installer succesfully.