How do I compile a batch file to an existing .exe

What i'm trying to do is every time I open a .zip, a specific sound and text file open as well, in their default applications. I'm using WINRAR as default for zip, VLC default for sound, and Notepad for txt. I think a batch file is how one would do this in Win7. I'm going over commands and making the files open, but i'm not sure how to compile to the winrar.exe or if thats the way to go about...