Right clicking on a file and selecting "Quick View" will let you quickly view it's content. However, you'll notice that only a small number of files are supported by the Quick View. Here's how to add more file types to Quick View:
Run "Windows Explorer"
Select "View | Options" from the main menu
Change to "File Types" tab
Click on the file type you want to add to Quick View and click on "Edit."
Enable or disable Quick View using the "Enable Quick View" check box.