cannot establish COM Application object "InDesign.Application.CS6"

I run VBA scripts in Microsoft Excel 2010 that communicate with InDesign via COM Interface.

I did that successfully using InDesign CS4 and CS5, but with CS6 the Connection from Excel to the InDesign Application does not establish. The lines:

Dim InApp As InDesign.Application

Set InApp = CreateObject("InDesign.Application.CS6")

result in "error 13 type mismatch"

I checked the following

• reference to the tlb file is correct
• when typing commands in Excel VBA editor, IntelliSense Shows all the methods and properties, so the library must be present
• When InDesign CS6 is not running, it will start up, then the error Shows up
• The line "CreateObject("InDesign.Application.CS6")" runs without error, I just cannot assign the object returned to the variable

What to do?