I figured out that my problem was caused by a bug (https://sourceforge.net/tracker/index.php?func=detail&aid=3093376&group_id=93482&atid=604452) in ndiswrapper (not lack of support for NDIS6), however my reason for opening the bug is stil valid I think.
Windows XP supporting NDIS6 was just a guess, sorry. Jarl ** Bug watch added: SourceForge.net Tracker #3093376 http://sourceforge.net/support/tracker.php?aid=3093376 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/105013 Title: Feature Request: Support NDIS 6 (Windows Vista family) WiFi drivers -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
