The .JT format is suppose to be the CAD solution for lightweight graphics and works quite well when implemented properly. PTC has chosen to manage files from within the master (except drawing [?]) and therefore, all the overhead is stored into that one file. As to how it all actually works and how one can manage it seems to be a a formula stored in a secret lab somewhere in Roswell, NM because we sure are not privy to what is -really- going on in that alien's head.
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