Sorry Michael,

Just another consideration. We talking about export to dxf by "style" but what about export by "name"?
My STEP files are composed of several "bodies"; my step exporter set a name to each of them and MOI import them setting name property (but keeping everything as "Default Style").
I write a little script to create a style of every name in object tree; after that I can export in dxf with all stuff we discussed yesterday.

I would like to avoid this, why dxf exporter could not simply use "object name" as layer in export procedure?

Miquik