Hi Wayne,
First of all, an installation authoring system should (by default) never manipulate your data files.
If you compile the script again and the .exe is already code-signed, the compilation process will fail (Authenticode signing tool returns an error).
If you would like to change some code-signing parameters (e.g. timestamp, descriptive name, etc.) and the compiler code-signed your SOURCE FILE permanently, you have to recompile your own .exe. Not a good idea
Friedrich