Google indexing xml-files, how to prevent....

Hi developers,

maybe its a strange questions but i have a little dilemma.

I have some flash-xml sites and Google is indexing the xml-files.
When a user is searching (Google) and the text is inside the xml-file, the result of the search sometimes will be http://domain.com/file.xml
So when the user clicks on it only the xml-file is shown in the browser.

Question:
Is there a way to link or redirect the xml-file automaticly to the index.html of the site?
Or is there another way to prevent this?

Thanks in advance for any help!!!