Autodesk Inventor uses Extensible Mark-up Language (XML) files as a means of storing style information externally from Autodesk documents. Styles have been stored externally using XML since the 2012 release. This is to reduce file bloating on larger assemblies. Imagine if you will, a 10000 part assembly with a different set of styles stored in each individual part. […]
http://cadblog.co.uk/2016/04/08/getting-started-autodesk-inventor-styles-beginners/
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