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These cause issues: CON PRN AUX CLOCK$ (NT and older) NUL COM1 COM2 COM3 COM4 COM5 COM6 COM7 COM8 COM9 LPT1 LPT2 LPT3 LPT4 LPT5 LPT6 LPT7 LPT8 LPT9 See http://www.blindedbytech.com/2006/11/16/forbidden-file-and-folder-names-on-windows/
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss