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Hi Nhan, The procedure for loading the NetCDF-C library, especially on Windows, is a bit convoluted. I'll improve that for the 4.5.4 release, including documentation. Until then, here's what I suggest: 1. Copy the contents of "netCDF 4.3.2\deps\x64\bin" to "netCDF 4.3.2\bin". Go ahead and overwrite existing files if Windows prompts you (they're identical). 2. Create a new environment variable called "JNA_PATH" and give it the value "netCDF 4.3.2\bin". 3. Start a new command prompt so that the new variable gets picked up, and then run NetCDF-Java. 4. You should now be able to write NetCDF-4! 5. You can delete the additions you previously made to the system PATH if you wish. Let me know if you have any problems. Cheers, Christian Ticket Details =================== Ticket ID: RWH-394641 Department: Support netCDF Java Priority: Low Status: Closed