That's correct. When you try to initiate a conversion of any Office format files, Acrobat will try to launch that application to complete the conversion.
I get this same error when I am trying to combine two .PDF files into one. All of the files I am trying to include are .PDFs. What' up?
OS X 10.9.1
Adobe XI Trial.
What if you have Office installed?
You're replying to a very old question. If you have a similar problem please post it under a new thread with the full details.