title: Edit a .ppam file for customizing an add-in
body: <p>I was provided an add-in for powerpoint as a .ppam file and another add-in for Excel as .xslm file. The add-in's work great, but I would like to customize them with some internal requirements. </p>
  
  <p>My questions is - how to open the source code behind a .ppam file ( which I understand is a compiled version) to be able to perform the customizations.</p>