Question about Archicad's User Interfase icon's naming convention ?

[Nader Belal]

Hello there,

So recently I have been able to extract the icons + graphics files that is used in the program's interface, and I suspect that they are following a convention, would you be kind enough to tell me what is the convention that is following for naming the different icons and graphical representations ??

Example, I have many icons that it's names star with an underscore "_", others with a digit, and others with a letter. What the difference between them ?