Hello,
I ran into appcompactor and found it easy to use upx gui.
I am wondering whether it would be suitable or not to include optipng inside it; that software is designed to minimize the size of portable network graphics without any loss of detail.
under windows in a batch file I can do
for /r . %%G in (*.png) do optipng -o7 %%G
under linux, find . -iname "*.png" -exec optipng -o7 {} \;
It works pretty well and can be useful to reduce even more the size of some portable apps.
Have a nice day and thanks for offering that application,