Imagine situation that somebody received e-mail with the Power Point Presentation 2007 files, or downloaded few presentations saved in MS Power Point 2007 file format or your friend brought few presentations and you did not have MS Office 2007 installed.
In such situations there is very simple and free decision which will allow you to view .PPTX/.PPSX files without Microsoft Office 2007 installation.
To view .PPTX/.PPSX files saved in Microsoft Office 2007 file extension - download Microsoft Power Point Viewer 2007.
1. Install this program, just follow on-screen instructions. The program is installed in Microsoft Office folder in Program Files by default.
2. Run the program from "Start" menu:

3. The "Browse" window appears, choose the folder with the file:

4. Select the file and press "Open" button:

NOTE: This program allows ONLY to view and print .PPSX/.PPTX files. Files cannot be edited with this software.