Don't use 'Save' or 'Save as'. Use 'Export' to save into 'Doc' format.
'Send' only works if you've got an email client installed (such as Outlook Express, Thunderbird or Windows Live Mail) and your computer knows that it should be opened when you use 'Send'. (It opens that client with your document already attached to a blank email). If you're using a web-based service (or if your computer doesn't know which email client to open when you click on 'Send') simply create a new email, in exactly the same way as if you were only sending a text-only message, click on 'Attach', navigate to the location of your file and then double-click on it.