shapefile : dgnlstyle-AcDBD07.shx

I am looking for the shapefile dgnlstyle-AcDBD07.shx for use in an exported autocad drawing.

Does anyone have this shapefile. The original drawing was probably made in a Bentley product and exported to AutoCAD. When AutoCAD does not have this file available to him it runs very slow because it has to regenerate / convert linetypes. I have as a temporary solution a similar file renamed ... dgnlstyle-AcD6B00.shx ... which seems to work quite well.