When you try to save a presentation as a webpage in Microsoft PowerPoint 2010, the following Save as type options are not available in the Save As dialog box:
Web Page (*.htm;*.html)
Single File Web Page (*.mht;*.mhtml)
To work around this issue, you can save presentations as an .htm file or as an .mht file by using the PowerPoint object model. This method provides compatibility with older add-ins and macros.
You can also save a file as a webpage (*.htm;*.html) to the desktop without embedding True Type fonts (msoFalse) by using the ppSaveAsHTML argument for the *.htm file format. To do this, follow these steps:
In PowerPoint 2010, open the presentation that you want to export to HTML.
In the Immediate pane, type the following, and then press Enter: