Extension	File Type Developer	File Category	File Type Description	Primary Software	Primary Software Developer
.OCD	Ocad Inc.	CAD Files	OCAD Map File	OCAD	Ocad Inc.
.OFE	Unknown Developer	CAD Files	3D Boat Design File	Model Converter	Creative Systems
.OL	Valve	CAD Files	Valve Hammer Object Layout File	Valve Hammer Editor	Valve
.OLB	Microsoft Corporation	CAD Files	OLE Object Library	Microsoft Excel	Microsoft Corporation
.OPJ	Cadence Design Systems	CAD Files	OrCAD Project File	OrCAD PCB Designer	Cadence Design Systems
.OPT	LexisNexis	CAD Files	Concordance Database File	LexisNexis Concordance	LexisNexis

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