When you open a .PPS or .PPT file that came as a mail attachment in Windows Mail or Windows Live Mail, you may see the Open / Cancel dialog box. When you select Open, the following error may be displayed. This may happen even though you have PowerPoint Viewer 2003 or 2007 installed. However, the same file may open correctly when saved to disk, and then viewed. Note that this problem does not occur if you have Microsoft Office or PowerPoint installed.
[Error Message]
This file does not have a program associated with it for performing this action. Create an association in the Set Associations control panel.
This error occurs if the Open command is missing for .PPS and/or .PPT file types. To resolve the problem, follow these steps:
Note: This article is applicable for Windows Vista or Windows 7 PCs, with PowerPoint Viewer (2003 or 2007) installed. For a Windows XP version of this article, see article Unable to open .PPS attachments directly from Outlook Express?
For .PPS files (Microsoft PowerPoint Slideshow)
1. Click Start, type regedit.exe and press ENTER
2. Navigate to the following branch:
3. Right-click Show and click Rename
4. Type the word Open so that Show is replaced by Open
5. If you have PowerPoint Viewer 2007 installed, repeat the above steps in this key, as well:
6. After changing Show to Open, close Registry Editor window.
For .PPT files (Microsoft PowerPoint Presentation)
1. Click Start, type regedit.exe and press ENTER
2. Navigate to the following branch:
3. Right-click Show and click Rename
4. Type the word Open so that Show is replaced by Open command
5. If you have PowerPoint Viewer 2007 installed, repeat the above steps in this key:
6. After changing Show to Open, close Registry Editor window.
Screenshot

(Fig 1) Show is renamed to Open
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No! I found that if you change Show to Open it does allow WLM to display the .pps slideshow but then you can’t display the .pps file from the desktop. Solution is to add an Open command just like the Show command and both will work ok. I only had to add Open to SlideShow.11 although I’m running Viewer 12 on Windows 7 laptop.
I have Powerpoint Viewer 2007 installed on my HP A6400F with Vista and all updates. Recently I have been receiving emails with “Microsoft Office PowerPoint Macro-Enabled” (.PPSM) emails that will not open even following the download sequence. WHY? I do not have Office 2007 and only have Microsoft Works? Is there an update that I’m missing?
Second question. I have a second desktop and a Dell Mini 9 with XP and have read that there is a major problem with the 02/2010 Updates from Microsoft that has caused major bluescreen problems when these updates are downloaded and installed, is the a revision forthcoming from Microsoft?
Thank you,
Jim Dougherty