On this screen of Work Environment (Options > Work Environment > Publisher), you define options used by the Publisher function:
Publisher log location: Enter a file path, or use the Browse button to access a file directory dialog box to specify a file path on your system.
This path shows the save location of the publishing log file, which is generated every time you publish an output using the Navigator/Organizer’s Publisher map.
To view the log, click the Show the log file button.
For more information on Publisher see Publisher Function.