I was attempting to use the optimization library which utilizes GenOpt along with my 64-bit installation of TRNSYS18. I have configured the TRNOPT17.exe program for the correct directories, then set up the optimization details as desired.
However, when I hit "Run Optimization" GenOpt terminates with an error. Looking at the GenOpt window, it is clear that the error is caused by the command string attempting to run "TrnEXE.exe" instead of "TrnEXE64.exe".
The TRNSYS17.cfg file that is created by TRNOPT17.exe in the ./Optimization/GenOpt/Simulation/ folder prior to the run is the source of this incorrect reference. This file is automatically generated when you hit "Run Optimization" within TRNOPT17.exe prior to calling GenOpt.
If you edit that .cfg file to point to "TrnEXE64.exe" correctly, you can start the optimization by clicking on "File" -> "Start" in WinGenOpt and selecting the TRNSYS17.ini
This is more of a bug-report and advice for others who may run into this issue than a request for help, as I've found a workaround. Please consider updating TRNOPT17.exe to correctly build the GenOpt files for a 64-bit TRNSYS install.
Thanks,
-Brandon