The name itself comes from a word meaning someone who makes stuff. It comes from the Latin word meaning a craftsman. In the afterword to one edition of the book, Ray Bradbury points out that Faber is part of the name of a pencil making company, Faber-Castell.
In Windows 7, 8 and 10, you can set the default mail client in the Control Panel's Default Programs applet. Select Outlook from the list of applications on the left and click the button to Set this program as default. When you use the 64-bit versions of Outlook 2010 or Outlook 2013, some applications will report that there is no default email client when they try to send email.
Re: Winmail.dat. Make sure your email program is not set to send emails as rich text which is the Outlook default. Only outlook can decipher this format. Any other program other than Outlook cannot open it, so it wraps the entire message and attachment into a winmail.dat file and attaches it to the email. In Outlook, you can change settings for each individual contact to either plain text or HTML and it should stop this behavior.