Posted by Tom Bombadil on Feb 21, 2012; 11:45am
URL: https://forum.jogamp.org/Help-Java-path-error-when-creating-native-binary-exes-tp3760329p3763321.html

"If a DLL is missing from inside this file, that would probably mean that in your JOGL fragment project, the "Build" tab of the MANIFEST.MF probably doesn't have the DLL files checked in the "Binary Build" list. "

This fixed it, woo hoo! Not quite sure how I managed to miss that step, but there we go. Many, many thanks for your help.