After reinstalling Vista a couple of months ago, today I noticed that there is no .pps extension listed in Control Panel\Default Programs\Associate..... As a result, I can't open .pps files.

I notice it is in the registry.

How do I add it in the Default Programs?

Yep. I previously had the 2003 and 2007 viewers and they worked just fine. I now have the 2010 viewer. The problem is that .pps is not shown in the file association list so that I can assign the viewer to it. As I said, .pps is shown in the registry. It is assigned to something there (I'm not on that machine right now) and might have to change it.

However, I have the Microsoft 2007 Office Home version installed which consists of Word, Excel and Outlook. It does have the trial version of the other apps, including power point. I've replaced file associations related to PowerPoint to the Viewer. I had to reinstall that after reinstalling Vista.

Good point. Didn't think to try it. I'll give it a try tomorrow when I'm on that computer. Thanks.

Yes, it worked and the .pps is now under the Default Programs, Associate...... It is strange though. I told it to open it with Viewer 2010 and it did. But, in Default Programs it set the default to my MIcrosoft Office 2003-2007 Power Point Viewer. Obviouly, I changed that to the Viewer 2010 and now everything is working properly.

Thanks for your help.

I wanted to give you a star but haven't figured out how to do that.