First of all, as I mentioned in the title, this post is about how to create or manipulate deb files of an already compiled application. In this topic I’m not going to explain you how to create a deb starting from source code :)
I’ll try to give you every possible indication in this article, if you miss some information but find the article interesting, please comment and ask me how to make things I failed to explain.
Not going to tell you what a .deb file is and what it is for, but you should really know that a deb is just a common archive in an .ar format, camouflaged with another name. So, right clicking on the deb file and choosing to open it with a common compressed files manager (such as file roller in gnome and OpenGEU) will work and show you the contents of the file. Now, you can modify an already existent deb file or create one from scratch. Should you prefer the second option, don’t be scared, it really is a simple task.