late binding on VB6

Hi all,
I want to create version independent VB6 ActiveX dll for AutocadMaps
(2004,2005,2006). Your sugestion how to do this??

In my opinion:
With AutoCAD everithing is ok sample code:

public g_acadProgr as Object
Set g_acadProgr = GetObject(, "AutoCAD.Application")
If Err Then
Err.Clear
If Err Then
msgbox "No acad runing"
Exit Sub
End If
End If

but Map is interface object of AutoCad and I can access it with:

Set g_amap = g_acadProgr.GetInterfaceObject("AutocadMAP.Application.2")
'2004 Map
"AutocadMap.Application.3"
'in 2005 Map

Now I thinking how to get version of AutocadMap user is running and calling
my dlll.... do ACADVER System Variable hepled me?? Or another soliution to
put this string (AutocadMap.Application.3) into a registry when setup
program of my application runs....
Thank you for any sugestions.