I have a computer that is running Windows XP with Office 2007 Professional. He is having problems only with the Powerpoint files in the office, specifically .pptx files. When you double-click on the file it opens up to a blank presentation. Once that is open if you click open and navigate to the file then it opens correctly.
I have checked the registry and the open/command path is correct. Any other ideas will help. All the others work fine Word, Excel and Outlook.