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then (conceivably!) I could just make the changes in the resources for the game, copy them into a plug-in made by ResEdit, and make my contribution.
Um... I wouldn't make changes in Nova's resources and then copy them into your plugin. A better way would be to copy the resources into your plugin and then make your changes. If you do it the other way around, your changes are going to become a permanent part of Nova (untill you replace the data files), and it would defeat the purpose of making your plugin.
Of cource, changing the data files can be the best option for TC plugins, because then you don't have to worry about any of the existing Nova data...
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(url="http://"http://www.geocities.com/newkongindustries/")New Kong Industries (/url)