Extension	File Type Developer	File Category	File Type Description	Software	Software Developer
.CUB	Microsoft Corporation	Data Files	Analysis Services Cube File	USGS ISIS	USGS (United States Geological Survey)
.GKS	USGS (United States Geological Survey)	Vector Image Files	Graphics Kernel System File	MODPATH	USGS (United States Geological Survey)
.NAM	Aqua-3D	Data Files	Aqua3D Network File	USGS MODFLOW	USGS (United States Geological Survey)
.PQO	USGS (United States Geological Survey)	Data Files	PhreeqcI Data	PhreeqcI	USGS (United States Geological Survey)

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