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Extension	File Type Developer	File Category	File Type Description	Software	Software Developer
.RAT	World Wide Web Consortium (W3C)	Uncommon Files	PICS Rating File	Autodesk AutoCAD Civil 3D	Autodesk, Inc.
.RTC	Brain Innovation	Data Files	BrainVoyager QX Design Matrix File	Autodesk AutoCAD Civil 3D	Autodesk, Inc.

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