Write to to resources location from another module

Hello,

I'm loading images using ImageUtilities.loadImage(String resourceID) in 
a viewer module.  In a separate editor module I'm trying to use a 
filechooser dialog that can be used to select an image file which would 
then be copied to that resource location.  I tried to use 
System.getProperty("user.dir") but that is not a resource and so returns 
null.

Can I get that particular module's class loader and get a path to that 
resource location so that I can write an image file to it from outside 
that module?

-- Mark Wade