Easy low tech question about file types

I was looking for a way to have files of certain types open by an application that I create. I happened upon the file type tab under folder options. However, I saw something that intrigued me. After some of the applications, "%1" appeared after the name of the program that after the files. I know it's an argument but is it how the program is told the name of the file? I assume that it's a macro and will expand once the program is open.

Main question: Does "%1" expand to the file name before it is sent to the program or will the program have to resolve the macro for itself?

Comments

  • :
    : Main question: Does "%1" expand to the file name before it is sent to the program or will the program have to resolve the macro for itself?
    :

    It will be expanded, if you have a WinMain, you will get it in the 3rd parameter (the LPSTR lpCmdLine)
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