Sometimes it may be desired to control what Working Units are displayed and available for use within files. For example, only having Meters and Millimetres as the available Working Units.
This can be controlled using a combination of the variable MS_CUSTOMUNITDEF and the unit definition file, units.def. The units.def file is an ASCII text file located in the .../Workspace/System/Data folder by default. The variable MS_CUSTOMUNITDEF points to this file.
Image 1 - Standard Working Units display
Image 2 - Modified Working Units (Units.def), only Meters and Millimeters listed
Working Units [FAQ]