ua-parser-php is now distributed via the central ua-parser GitHub repo maintained by Tobie Langel, Lindsey Simon, and myself. See the link below to review the latest code.
Looks like this is a Windows Mobile device
UA: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; XBLWP7; ZuneWP7)
(fyi I'm going to submit issues here if I discover any :-)
I'm starting the job of updating all the yaml's in the test_resources dir to match what you have in your extended regexes.yaml - I'll then submit a pull request to tobie pulling yours in and the test_resources will be there if you want to write some tests against that =)