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Currently Windchill Workgroup Manager doesn't support these drawing formats extensions .slddrt
User have to store the formats files in a shared folder to insert or modify a frame in a drawing.
These files would be managed by Windchill
https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS64181
http://support.ptc.com/cs/help/windchill_hc/wc110_hc/index.jspx?id=WWGMGeneric_GS_FileTypes&action=show
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