Michael, Here's a url about configuring an IOSP loading at runtime: http://www.unidata.ucar.edu/software/netcdf-java/reference/RuntimeLoading.html Also, here's the tutorial page that has information about creating/configurating an IOSP http://www.unidata.ucar.edu/software/netcdf-java/tutorial/index.html An important part of any iosp is making sure that method isValidFile() in your iosp returns true when your file is opened. RObb... Ticket Details =================== Ticket ID: MTW-525020 Department: Support netCDF Java Priority: Urgent Status: Open