This command loads the MotionBuilder presets provided with each release.
You can use this to load the MotionBuilder Import/Export presets without knowing their file path.
For example: FBXLoadMBImportPresetFile; loads "C:\maya2015\bin\plug-ins\FBX\Presets\2014.0\import\Autodesk MotionBuilder.fbximportpreset" and FBXLoadMBExportPresetFile; loads "C:\maya2015\bin\plug-ins\FBX\Presets\2014.0\export\Autodesk MotionBuilder.fbxexportpreset" (The path may be different on your machine.)
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