On Windows, Beersmith installer sets file associations. I can't find a way to do that without uninstall/reinstall.
On your desktop, right click the bsmx file and select Open With then find Beersmith3 and check the box to always use this app... Then click OK. Windwos sould now always with beersmith 3.
You can share the bsmx with other beersmith users who can import or just double click the file then in beersmith 3, copy the recipe to the desired folder.
To print to PDF, you need a PDF print driver installed. You can print the recipe (opens a IE print dialog) then print to the PDF printer which will prompt where to save the PDF.
For different looks or output formats, with the default view, select a recipe but don't open it. In the bottom pane, you will see the recipe displayed. On the header for that pane, you can change the Report style. Then you can print or save. Depending on the report style, you can save as text or html. I like to use plain text and save a text file.