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Seems to be caused by incorrect quoting of the -r switch that the test runner passes to the rake command.
Fixed in #e41f2fc4af89.
Integrated into 'main-golden', available in build *200808031401* on http://bits.netbeans.org/dev/nightly/ Changeset: http://hg.netbeans.org/main/rev/e41f2fc4af89 User: Erno Mononen <emononen@netbeans.org> Log: #141502: Running Test/Unit tests with the test runner fails on WinXP