延期	檔案類型開發人員	檔案類別	檔案類型描述	主要軟體	主要軟體開發人員
.OCD	Ocad Inc.	GIS檔案	OCAD Map File	OCAD	Ocad Inc.
.OCP	Zylox Software, Inc.	GIS檔案	Offline Commander Project File	Offline Commander	Zylox Software, Inc.
.OKM	Gian Paolo Saliola	GIS檔案	OkMap Map Defining File	OkMap	Gian Paolo Saliola
.OMD	Pitney Bowes	GIS檔案	MapInfo Routing J Server Data	MapInfo Professional	Pitney Bowes
.OSB	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others	GIS檔案	OpenStreetMap Binary Map File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OSC	OpenStreetMap	GIS檔案	OpenStreetMap Change File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OSL	Ockam Instruments	GIS檔案	OckamSoft Log File	OckamSoft	Ockam Instruments
.OSM	OpenStreetMap	GIS檔案	OpenStreetMap Map File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OV2	TomTom International BV	GIS檔案	TomTom POI (Points Of Interest) Database	TomTom HOME	TomTom NV
.OZF2	D & L Software Pty Ltd	GIS檔案	OziExplorer Map File	OziExplorer	D & L Software Pty Ltd
.OZFX3	D & L Software Pty Ltd	GIS檔案	OziExplorer Image	OziExplorer	D & L Software Pty Ltd

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