FileViewPro

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

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相容 Windows 2000、XP、Vista 、7、8、10和 11