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Hi, You can download the entire repository, including the data files, here: https://github.com/Unidata/netcdf4-python/archive/master.zip Given the error message you received, you should double check your installation of netcdf4-python and libnetcdf. Ryan > Dear Unidata > > Would you please share a copy of the data in this link: > > > > > https://github.com/Unidata/netcdf4-python/tree/master/examples/data > > > > > when i used rtofs_glo_3dz_f006_6hrly_reg3.nc this error appears > > OSError: [Errno -51] NetCDF: Unknown file format: > b'data/rtofs_glo_3dz_f006_6hrly_reg3.nc' Ticket Details =================== Ticket ID: XCW-578226 Department: Support Python Priority: Low Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.