This option opens a standard file selection dialog letting you load a color table other than the default. By default you are prompted to select from a list of color table .INI files residing in the Settings directory of the main install folder such as below:

C:\Program Files\Bentley\OpenPlant CONNECT Edition\OrthographicsManager\Settings

In this directory, there are multiple color tables to choose from. Once you decide which table to load, all of the projects will use the newly loaded color table when generating an output file(s).