Extension Builder creates malformed icon file
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 I built a new extension without specifying an icon. 
 In the root directory of the .roboFontExt package, RoboFont wrote a file with the name 'Icon\r'. (ie. Icon plus the non-displaying carriage return character).
 Not a big deal, but it's a bug.
 
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 if you have assets (almost everything which isn't a python file) store them into a resource folder and connect it in the extension bundle. 
 see http://doc.robofont.com/extensions/extension-file-spec/to retrieve assets see http://doc.robofont.com/api/mojo/mojo-extensions/ good luck