You'll need to explain your question a bit more clearly. What do you mean by 'shuttle list'? I'm assuming you mean the scenario editor which allows you to add vessels?
Have you installed the XR2? it's an addon and so does not ship with the default orbiter installation.
Google also helps sometimes. Search for the XR2 and you'll likely stumble across http://alteaaerospace.com/, dbeachy1's website, which is the only legitimate download source for the XR vessels.
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