How do you prevent emailed word documents from always opening in the Reading Layout?
From the Tools Menu > Options > General Tab > uncheck the Allow starting in Reading Layout' do you prevent emailed word documents from always opening in the Reading Layout.
To change the default viewing mode in Word 2013, go to File → Options, and in Word Option dialog, un-check option “Open e-mail attachments and other uneditable files in reading view” under General section and Start up options. Click OK to save the change. And that's it.
Launch Microsoft Word. When adding attachments to an existing Word document, click the “File” tab, click “Open,” and then browse to and double-click the Word file. Scroll to the place in the document where the attachment should go and press the “Enter” key for a line break press “Ctrl-Enter” to add a new page.
In Read Mode, the PDF will be displayed in a way that hides much of the interface, including the navigation pane, toolbar, and status bar, to maximize the document display area. To switch to the the Read Mode, go to VIEW menu > click Read Mode. You can press the shortcut key "Ctrl + H" on the keyboard.