FileViewPro

Extension	File Type Developer	File Category	File Type Description	Primary Software	Primary Software Developer
.OBI	Microsoft Corporation	Settings Files	Outlook RSS Subscription File	Microsoft Outlook 2016	Microsoft Corporation
.OBT	Open Source	Settings Files	Openbox Theme File	Openbox	Open Source
.OCE	Oracle Corporation	Settings Files	Open Catalog Extension Connection File	Oracle Business Intelligence Suite	Oracle Corporation
.ODC	Microsoft Corporation	Settings Files	Office Data Connection File	Microsoft Excel	Microsoft Corporation
.OEM	Microsoft Corporation	Settings Files	Original Equipment Manufacturer Setup File	Microsoft Windows	Microsoft Corporation
.OFD	Cypresslogic Systems Inc.	Settings Files	ObjectView Form Definition Data	ObjectView	Cypresslogic Systems Inc.
.OFFICEUI	Microsoft Corporation	Settings Files	Microsoft Office UI Customization File	Microsoft Office	Microsoft Corporation
.OFL	Ots Labs	Settings Files	OtsTurntables Playlist	OtsTurntables	Ots Labs
.OIF	OriginLab	Settings Files	Origin Import Filter File	OriginLan Origin Viewer	OriginLab
.OMS	Hewlett-Packard	Settings Files	HP Printer Substrate Presets Package File	HP Embedded Web Server	Hewlett-Packard
.ONETOC	Microsoft Corporation	Settings Files	Microsoft OneNote Table Of Contents	Microsoft OneNote	Microsoft Corporation
.ONETOC2	Microsoft Corporation	Settings Files	Microsoft OneNote Table Of Contents File	Microsoft OneNote	Microsoft Corporation
.OODGUISETTINGS	O&O Software	Settings Files	O&O Defrag GUI Settings	O&O Defrag	O&O Software
.OPS	Microsoft Corporation	Settings Files	Office Profile Settings File	Microsoft Office	Microsoft Corporation
.OPT	LexisNexis	Settings Files	Concordance Database File	LexisNexis Concordance	LexisNexis
.OSDX	Microsoft Corporation	Settings Files	Search Connector Description File	Microsoft Windows	Microsoft Corporation
.OSS	Microsoft Corporation	Settings Files	Microsoft Outlook Saved Search File	Microsoft Outlook	Microsoft Corporation
.OTH	Apache Software Foundation	Settings Files	OpenDocument HTML Template	Apache OpenOffice	Apache Software Foundation
.OTZ	OpenLP Team	Settings Files	OpenLP Theme File	OpenLP	OpenLP Team
.OVPN	OpenVPN Technologies	Settings Files	OpenVPN Configuration File	OpenVPN	OpenVPN Technologies
.OXO	Open Source	Settings Files	Ox Object-oriented Matrix Programming Language Source Code	OX Professional	Open Source

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Compatible with Windows 11, 10, 8, 7, Vista, XP and 2000