Microsoft PowerPoint Presentations
When Microsoft PowerPoint saves presentations to Web pages, it creates various subfiles that comprise the functionality of the slides in a presentation. Each slide will have an HTML page that contains the data. There will also be a master slide in HTML for the slide master. Extra information about the files is stored in XML format. Other supporting files that are saved are sound files, graphics files, cascading style sheets, and proprietary files used to store OLE data that is required to reload the HTML into PowerPoint. A subset of these files are available to view in the Microsoft Script Editor when you open a presentation in it.
When PowerPoint saves a presentation as Web pages, it creates script to control the behavior of slide transitions and other animations. When viewing the source HTML for a presentation in the Microsoft Script Editor, it's important to avoid changing or removing any of the script that PowerPoint creates.