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Product Version: NetBeans IDE Dev (Build 200803251204) Java: 1.6.0_10-beta; Java HotSpot(TM) Client VM 11.0-b11 System: Windows XP version 5.1 running on x86; Cp1252; en_GB (nb) Observed: while being in the diff tab (after applying diff patch) when switching from built in diff to command-line diff the information message(not error - just message) "The diff command 'diff "<file1>" "<file2>"' failed to execute in the system." expected: something which actually tells the user whats wrong with the command-line diff - like telling him that the diff was not found or opening the "browse for diff executable dialog" or telling him, that he can set path to external diff at Tools -> Options -> Miscellaneous -> diff tab -> external diff. steps to reproduce: make sure the diff is not in the above mentioned path or in system path -> invoke diff tab in any way (e.g. tools -> apply diff patch ) -> set the engine to command-line diff