Honestly I think he's right, nobody would write such a general program, but everyone who is interested in reversing a nsis package should examinate the sources and understand how the installer is done. "You can't decompile an NSIS installer, at present, because the decompiler would have to understand all of the different types of binary headers from all of the different versions of NSIS, as well as know how to identify any of them that have had their source modified (since its open source), so, nobody has yet to write this psychic program." But this is not true at all: the truth is just that there isn't a nsis automatic decompiler out there. If you have script for an old installer that simply add new file to it and recompile installer from sources. NSIS has specific structure and it is sophisticated system not only simple archive. Best Solution There are several NSIS plugins that can extract from external archives: ZipDLL, NsUnzip, ExtractDLLEx, ExtractDLL, CABSetup or UnTGZ You could. There are voices who tell that it's impossible. 7zip can extract files from certain NSIS installers but it cannot insert new ones.
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