Hi guys, When I use the grib_api with windows IDL 8.3, I found there are some problems about grib api, such as: 1?when you set work directory other than default work directory, IDL will crash: cd, 'D:\data' f = GRIB_OPEN(filename) h = GRIB_NEW_FROM_FILE(f) ... 2?When I set the GRIB_DEFINITION_PATH environment, IDL will always change it to 'C:\Program Files\Exelis\IDL83\resource\grib\share\definitions' after call grib functions. 3?when I read a second_order packing grib file, the return values were wrong, which may be the grib_api 1.10.04 's bug. Now grib_api have upgrade to 1.12.3, so can you update the IDL's grib_api. https://software.ecmwf.int/wiki/display/GRIB/History+of+Changes Very thanks! Dave