Export Class problem

I am working on a class I want to use in a number of projects.
The class includes a number of graphics, all PNGs. When I export the class to save it as a stand alone item it “compiles” the graphics.
In effect “navigateHome.png” becomes “navigateHome.xojo_binary_code” making it fairly useless if I tried to use it anywhere else.

Am I doing something wrong?