Displays the conversion value or Scale Factor that the plug-in applies to the entire scene during export.
By default, the Maya FBX Plug-in uses the system units set in the host application to determine what units to use to export the FBX file. This means that the default export Scale Factor is always 1.0, and the plug-in applies no unit scale conversion during the export process.
You can modify what units the Maya FBX Plug-in uses to export your scene if you change the File units converted to option. If you change the File units converted to option, you modify the Scale Factor value and units applied to the exported data.