Because the appimage file is nothing more than a compressed file containing the same structure as the installed program plus other libraries that allow the program to run independently from the system, the content can be extracted so that you can work on it as you would have on the normally installed program. To do this you will need the appimage management program.
Many Linux distros come with this managment program by default, but others may not. For instance in the case of Arch Linux the \texttt{appimagetool-bin} package from AUR needs to be installed.
-To work on the appimage, first unpack it using the command\protect\footnote{Example provided by Glitterball3}:
+To work on the appimage, first unpack it using the command\protect\footnote{Example provided by Glitterball3} (note that you do not have to be root to do any of the following):
\begin{lstlisting}[numbers=none]
/{path to appimage}/CinGG-yyyymmdd.AppImage --appimage-extract