When Microsoft PowerPoint saves data to Web pages, it creates a main file (with the file name the user chooses) and a folder containing various sub-files.
The types of files that are saved include the following:
| Type | Description |
| htm | HTML file. Each slide will have an HTML page that contains the data. There will also be a master slide in HTML for the slide master, and usually an error.htm file that contains a list of errors. |
| xml | XML file. Extra information about the files is stored in XML format. There is usually a filelist.xml file that contains a list of the files. |
| js | JavaScript file. JavaScript code is used to create animations. |
| wav | Sound file. Other sound and video files may be saved as well. |
| gif | Graphics file. Other graphics files may be saved as well. |
| wmf | Metafile file. A backup of the slide is created as a metafile for browsers that cannot display XML. Compressed metafiles have the wmz file extension. |
| css | CSS file. Cascading style sheets define styles for the Web pages. |
| mso | MSO file. Proprietary file format used to store OLE and other data for recovery upon reloading. |
A presentation is made up of a series of slides. Each slide will have its own Web page. If desired, a table of contents frame can be created to "hold" the slides, so that when each item in the table of contents is clicked, the corresponding slide will be shown in the frame.