Update the content of a MatLab generated executable

I would like to update the content of an executable inside a generated executable MatLab file. The file is generated with MatLab/Simulink compiler. Why would I want to do this? Because I need to sign the content of all executable that run on my company pc. I know I can open the generated executable as a zip file. Inside I can update or add any file.

I have found that there is a sig1.xml file that contains the sha512 encoded with base64. So I have updated the sha512 signature of the modified file. But I have an error when opening the executable: CTF archive is invalid

Is there a global signature to update? Or anything else?

Any advice is welcome!

[Steven Lord]

What platform are you using? If you're using a Mac, see this Answers post.