Apple Automator Question Copy and Paste
Simple. Try the following workflow: 


Ask for Finder Items
Convert Format of Powerpoint Presentations
   New Format: Outline (Rich Text Format)
Move Finder Items
   To: Desktop (or as you wish)


This should work. 

I tested it. Then right click on the RTF and open with MS Word.

Here it is for you to download Powerpoint to RTF workflow.