Where do I find the icons used in EPDM?

I am working on templates in EPDM and, as you know, one of the items to define is the icon to be used by a particular file created.   I want to add other icons to this selection list, but do not know the home folder where they live.  I have searched and not been able to find it so far.

Can anyone point me to the folder where these icons are stored?

Thanks again!

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