Final answer:
The correct file type for publishing Microsoft Project data to the web is HTML, which is nonproprietary and widely accessible in browsers.
Step-by-step explanation:
The file type that enables you to publish Microsoft Project data to the web or an intranet site is HTML. When you want to share your project information on the internet, you can save and distribute your Microsoft Project data in HTML format. This ensures that the project can be viewed in any web browser without the need for Microsoft Project to be installed. Moreover, HTML is a nonproprietary format, which is compatible with the requirements found in paragraph 1.E.6., and ensures broad accessibility.