The options to save a presentation as a webpage are not available in the Save As dialog box in PowerPoint 2010
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:
ActivePresentation.SaveAs “<Drive>:\users\<username>\desktop\<filename>.htm”, ppSaveAsHTML, msoFalse
Note To save by using the Single File Web Page (*.mht;*.mhtml) file format, replace htm at the end of the file name with mht, and replace ppSaveAsHTML with ppSaveAsWebArchive.