V does not underline hyperlinks in files - such as http://www.fileviewer.com/, or create clickable hotspots like a browser does.
However, if a text file contains a URL, you may open the URL in your browser (not in V) by highlighting the text that forms the URL, right-clicking and selecting Open Selection in Browser.
You may also simply right-click over the URL (without selecting the actual text).
You do not have to highlight the entire URL - any part of the URL (even just one character) is sufficient.
If you only want to send part of the URL to the browser, simply select exactly what you want sent, and then press the Shift key when selecting Open Selection in Browser.