Open Explorer. From the menu choose View | Options.
Go to the File Type tab and find the association for Web pages. The name for those files is determined by the Web Browser that created the association and should be something similar to "Internet Document." 
Select the association and click Edit. 
Now put a check mark next to "Enable Quick View." 

Voila, you now can choose to view the HTML source code by right clicking on the file and choosing View.

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