So I received a fortran 90 program file and a c program file from my professors and they ask me to study about it. These programs were designed such that they will call LTspice from the c program, which is then called by fortran. Since they programmed it in Windows, the first challenge was to modify all the directories for my PC, whose OS is Mac. Now after modifying all of the directories written on the program, from the log file generated after the program run, I get this error: Fatal Error: Could not open library file "C:\PROGRAM Files\LTC\LTSPICEIV\lib\cmp\standard.dio" Now, I could not trace where I should fix the error in fortran and c codes because I do not see any line related to standard.dio, which contains all the component models definition for LTspice. One workaround that I tried is placing the SPICE statement below, thinking it may override the default library file directory called: .inc /Applications/LTspice.app/Contents/lib/cmp/standard.dio But it still produces the same error. So my question is, where exactly should I fix this problem? I'm not even sure if this is a Mac-based issue but I am asking the same question to SPICE forum just in case. Should this be fixed in the c program or somewhere in LTspice? Thank you very much! For reference, kindly see the uploaded screenshot.