Hi Burr, yes the basic strategy for opening a file (of any type, whether 3DM, IGES, SAT, or STEP) is that the contents of the file replaces your current model data. So any old data gets cleared out so that only the new data is then visible.
The "model data" includes both objects and your styles list.
Import on the other hand is meant to keep your current model data and then merge the other file's data into the current data rather than replacing it. So you can use Import instead of Open if you want to keep your current styles list in place and only add to it rather then replace it.
One thing I've though some about though is maybe having another menu item under the Style tools dropdown (the menu that pops out from the arrow on the Styles header in the scene browser) that said something like "Add default styles", which you could hit to pull in the default set of styles (either the regular default, or the ones from the template file if a template has been set up)... Does that sound like it would help for this situation?
- Michael
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