Oh, if you use Mac and Safari, viewing XML files is definitely one of worst things ever.
You have to open it and then use the ‘view source’ option to handle it.

This Safari Plugin called XMLView Plugin can make things easier. Just download it and uncompress it on your $HOME/Library/Internet Plug-Ins folder.

Close and reopen your Safari, and open any xml. You’ll se a well-formated XML with syntax highlight and expand/colapse options.

If you’re not following me on twitter, you own me a dollar for this one.