Windows dtest: cqlsh_tests\cqlsh_copy_tests.py failing with Permission denied

05:39:07 ======================================================================
05:39:07 ERROR: test_source_copy_round_trip (cqlsh_copy_tests.CqlshCopyTest)
05:39:07 ----------------------------------------------------------------------
05:39:07 Traceback (most recent call last):
05:39:07   File "D:\jenkins\workspace\cassandra-2.2_dtest_win32\cassandra-dtest\cqlsh_tests\cqlsh_copy_tests.py", line 789, in test_source_copy_round_trip
05:39:07     with open(commandfile.name, 'w') as commands:
05:39:07 IOError: [Errno 13] Permission denied: 'd:\\temp\\tmpawtlxf'
05:39:07 -------------------- >> begin captured logging << --------------------
05:39:07 dtest: DEBUG: removing ccm cluster test at: d:\temp\dtest-9dklfv
05:39:07 dtest: DEBUG: cluster ccm directory: d:\temp\dtest-98gttb
05:39:07 dtest: DEBUG: Exporting to csv file: d:\temp\tmppok0qa
05:39:07 --------------------- >> end captured logging << ---------------------