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Hi Camilla, > I am using a tool called NCO to play with my WRF output file (in .nc > format). I am using netcdf 3.6.2 version and the .nc file is 64 bit > offset. However, when I run the NCO, error occurs - Not a netCDF. Is it > possible to solve this problem? This could occur if your version of NCO is statically linked to an old version of netCDF, before 3.6.0. Otherwise, NCO should recognize a 64-bit offset netCDF file. You might determine whether NCO is linking to an old shared library by runing the unix command ldd ncks and checking the output for an old netcdf.so shared library. Does ncdump recognize the file? --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: JWI-679999 Department: Support netCDF Priority: Normal Status: Closed