To NSIS Developers: Programm identification

Hello,

We developed security application and have special data about trusted application. Trusted application may do everything in system without some restriction. Is there some method or somethihg else to identify NSIS? I mean What I must check to exactly know that running application IS NSIS? Version infos of PE file, special signature into PE file?

Well if it's flexible and powerful but easy to use, then yep it's NSIS!

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You can verify the header. Take a look at Source\exehead\fileform.c: loadHeaders().