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Extension	File Type Developer	File Category	File Type Description	Software	Software Developer
.HDC	TCD Labs	Data Files	HD Tach Benchmark Results	Autodesk AutoCAD Civil 3D	Autodesk, Inc.
.HTP	Autodesk, Inc.	CAD Files	Autodesk Slope Template Definition	Autodesk AutoCAD Civil 3D	Autodesk, Inc.

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