This advanced option must be set in an initialization (.ini) file.
This advanced option points to the folder that contains the Tekla Structures log file.
By default, the file is stored in %LocalAppdata%\Trimble\Tekla Structures\%Version%\Logs. The log entries for the last five Tekla Structures sessions are stored in the folder.
This advanced option is system specific and is read from environment files. Generally, there is no need to modify system-specific settings. Do not modify them if you are not an administrator.