SAP icon to represent .zip or .txt file?

Hi,

I have not been able to find an SAP icon that represents a zip file, a text file (.txt) or a .png file. I used transaction code 'ICON' to view all of the SAP icons but there is nothing there that meets my requirement.

Anyone have any tips? Is what I'm asking or even possible? Can we import icons into SAP?

Thanks,

Jennifer