I apologize for the confusion. I haven't seen issues with our importer not recognizing .xml files from Xanga before, so I thought there might be an issue with the actual export file.
I'd like to walk through the process with you to see if I can determine where the problem may be.
1. Please go to your WordPress.com blog's Importer at https://alllllz.wordpress.com/wp-admin/import.php 2. Next, choose the Xanga import option.
3. Click on the button "Choose file" and find the first of the .xml files to import from your .zip folder.
4. Click "Upload file and import."
If that is where you are running into issues, can you let me know the actual file name of the first file you are trying to upload, and could you please post a screenshot of the error message you receive to your blog's media library, where I will be able to view it?
Instructions on how to take a screenshot are on this page: