When you say it "crashed", did it not give any sort of error return code from nc_open? Also, what does this command do: ./ncdump -h d:/08_02_2017-2.cdf =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: DHL-551530 Department: Support netCDF Priority: Urgent Status: Open =================== 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.