Hello, I have a little problem linking the CGNS libraries. I tried linking the CGNS libraries with the compiler, but the same error shows, viz. "CG_OPEN_F is an undefined reference". I guess this has probably got to do with modifying the lib and include path or something like that. Right now I am short of time and would really appreciate if someone who has the libraries installed can run my little code and send me the resulting CGNS file. I have attached a zip file of the code(f95) and also a text file containing the data points which the code reads in. Thanks, mocha Or could someone tell me how I can fix the error? Its in Windows and am using Silverfrost Plato. I modified the paths at both places, i.e I did everything the ReadFile says. am wondering why no one's replied. will it help if I give a C code?