Extension	File Type Developer	File Category	File Type Description	Software	Software Developer
.OC_	Microsoft Corporation	Compressed Files	Compressed ActiveX Control File	Microsoft Windows	Microsoft Corporation
.OEM	Microsoft Corporation	Settings Files	Original Equipment Manufacturer Setup File	Microsoft Windows	Microsoft Corporation
.OLE	Microsoft Corporation	Data Files	Microsoft Object Linking And Embedding Data	Microsoft Windows	Microsoft Corporation
.OSC	OpenStreetMap	GIS Files	OpenStreetMap Change File	Microsoft Windows	Microsoft Corporation
.OSDX	Microsoft Corporation	Settings Files	Search Connector Description File	Microsoft Windows	Microsoft Corporation

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