Those are Premiere Elements project files... read below
The Elements Tutorial Links Page http://forums.adobe.com/thread/1275830 may help
-link above has the direct Amazon link to buy Steve Grisetti's book on Premiere Elements
What version of Premiere Elements, what computer operating system?
What is your project preset, and what are the properties of your source files on the project's Timeline.
Please supply the above information, and I will give you detailed Premiere Elements (version specific) how to instructions.
In Premiere Elements 14, the sharing area is called Expert & Share, and its layout and other features are markedly different than the sharing area in version 11 through 13/13.1 (called in those versions Publish+Share).
Any questions or need clarification on the above, please do not hesitate to ask.