On another note, what is the intended purpose of this folder?

The Resources folder is used for assets like image, everything except .py files.

This is handy in combination with an ExtensionBundle object

from mojo.extensions import ExtensionBundle

myBundle = ExtensionBundle("MyBundleName")

# assuming in the Resource folder there is a file called "myToolbarIcon.png"
# when retrieving files from a bundle an extension is not required
# this will return a NSImage object
toolbarIcon = myBundle.get("myToolbarIcon")

see:

• http://doc.robofont.com/extensions/building-extensions/
• http://doc.robofont.com/api/mojo/mojo-extensions/

from AppKit import *

print NSImage.imageNamed_("ExtensionIcon")