can't edit powerpoint presentation

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1. unable to edit a power-point presentation. Error “We can not open this

   

2. 3 Ways to Protect PowerPoint Presentation from Editing and Modifying

   

3. PowerPoint cannot be edited, why and how to handle it?

   

4. Is Your PowerPoint Read-Only? Here’s How to Edit and Save it!

   

5. Why People Fail to Add or Edit Text Correctly in PowerPoint?

   

6. ¿Cómo editar una presentación de Powerpoint?