The Mac works like Windows. It tries to open a double-clicked file using the last program that said it was interested in that file type. In the case of files with .xml on the end of the name (their "file extension"), it seems some game software lays claim to them. But they are just text files, really.
You can tell Mac OS to change the program it opens them in by right clicking one of these files and selecting "Open with" -> "Other ..." in the resulting pop-up menu. That will open a list of your Applications folder and you can choose your favourite text editor*.
Select the editor of your choice, and click the Always Open With checkbox to ensure that this will become the default application for xml files. Click "Open" and you are done.
* - TextEdit is the standard text file editor on a Mac (make sure you save edited xml files as text, not rich text). There are other options such as TextWrangler/BBEdit or TextMate that are favoured by programmers. There are also some dedicated XML editors available that can help to ensure that you create valid xml format when you change something.
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