You need to have Powerpoint installed on your computer to take advantage of the self-contained Powerpoint slideshow files. Windows users, your computer will probably try to save the file as a .zip file. You must change the file extension to .ppsx in order for it to open correctly. If you are not using Office 2007, you will have to download a compatability pack from Microsoft to use this file type. Macintosh users, you must download a conversion utility for Powerpoint 2004 on your Macintosh that allows you to view this file type. It is available for free from Microsoft. Your version of Powerpoint will prompt you to download the file when you try to open a .ppsx file.
From the following link You Can download nearly 45 types of Power Point presentations or Flash files which will be very very useful for your Chemistry teaching at High School level
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