Removing environment variable fixes the problem. Everything works fine with non-native links (i. e. CYGWIN not set) and on native unix-like systems. The only configuration that fails to "lock" the file (whatever it is) is Cygwin with native hardlinks. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple