AutoCAD VB :: Run VB6 Application With Different Version?

I have a Visual Basic 6.0 Project , to manage CAD Data I want to open a file in Autocad

1) in VB6 , I add Project / Reference / Autocad 2006 Type Library

2) I use following code (see below) , to select application , start Autocad if not already started , open File

3) I compile Mycode : MyCADProject.exe
=> start MyCADProject.exe , I select a DWG file and I can open the file in Autocad 2006 : OK

Problem , I have new PC one with Autocad 2010, one with Autocad 2009 (all other PC are with Autocad 2006) in My VB6 Project 1) I can not sellect both library "Autocad 2006 Type Library" and "Autocad 2007 Type Library" => I get a Windows error Message "Librairie déja utilisée" 2) If I select only one Library , this run well for one version of Autocad , but not fot the other version ! I want to manage only one version of MyCADProject.exe

Is is possible to run a VB6 project with different version of Autocad ?

Dim Acadapp As AcadApplication
On Error Resume Next
Set Acadapp = GetObject(, "AutoCAD.Application")
If Err.Number <> 0 Then
On Error GoTo 0
Set Acadapp = CreateObject("AutoCAD.Application")
End If
Acadapp.Documents.Open (Myfile)
Acadapp.Visible = True