You have a SharePoint generated email containing a hyperlink or you paste a URL like http://sp2013ocsi/Shared%20Documents/DateTest.docx into the Chrome browser.
When the above happens, Chrome downloads the document, instead of opening the rich client Office application that opens a live server document.
This is how Chrome works.
If you add ?web=1 to the end of the URL, then Office Web Apps will render the document and from the Web Apps, the user can pick to open in the rich client.
For example: http://sp2013ocsi/Shared%20Documents/DateTest.docx?web=1