Hi Phillipe,
The test suite has been overhauled. A lot of tests used to rely on file names that weren't guaranteed to be good test files. If multiple tests ran at the same time, the tests would clobber each other's files, etc. We've corrected that.
We believe the 9999.20_03 release should behave as expected on cygwin. Please let us know if that's not the case.
Thanks,
Chase