Some of the Windows test groups are dependent on an English language version of Windows. Well, only the special folders test at this time. But possibly some future test groups could.
Add a new test type: English_Only. The special folders test group is marked as that test type. It can be excluded from execution using: -X english_only
Any one that considers this a bug, can submit a version of the special folders test group in their language and we will add a way to the test suite to run the proper language version.