i would be glad to know if it is possible to protect the setup file from 7zip ? when you make "open with 7z" you can extract any files from your setup , there is a way to protect them ?
nsis : how to protect files extraction from 7zip file manager
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NSIS is open-source and will therefore always be susceptible to decompilation.
The best option is to re-compile NSIS yourself (admittedly this is a bit hard to do). After downloading the source you would have to reorder a couple of the EW_ entries in \Source\exehead\fileform.h. For example, move
EW_CALLdown to afterEW_LOCKWINDOWand the build NSIS (you must build makensis and the stubs as a minimum). 7-zip will not be able to decompile your installers made with this custom NSIS.The other option is to encrypt your files. Anyone with access to a debugger will be able to find your encryption password though.
If you are doing this to prevent piracy; it is much better to put the protection in the installed application, not the installer...