There are two ways to open a Microsoft Word Document from the Backstage view:
Select Open from the FILE menu.
From the Open section, select the location of the document. If it is on the computer, double-click Computer (this step is not present in Microsoft Word 2010). In the dialog box that opens up, navigate to the file you want to open and double-click it or select it and click Open. You can use the All Word Documents drop-down list to select and open files that are not native to Word.
For files you have recently used, select Open from the FILE menu and then select the file under Recent Documents. (In Microsoft Office 2010, simply select Recent from the File menu.)