File extensions starting with O

#	Extension	Developer	File Type
1	O	N/A	Compiled Object Format
2	O2C	N/A	Objects To See 3D
3	OAB	N/A	Offline Address Book
4	OAM	Adobe Systems	Adobe Edge Animate Widget Format
5	OAP	Samsung Group	Samsung Bada Signed Installation Package

6	OAS	rsbr Software	Microsoft Outlook Attachment Sniffer
7	OAT	Google Inc.	Google Android RunTime Code
8	OBB	Google	Android Opaque Binary Blob Format
9	OBD	Microsoft	Office Binder Document
10	OBI	Microsoft	Outlook RSS Subscription Format
11	OBJ	Wavefront Technologies	Wavefront 3D Object Format
12	OBPACK	Stardock Corporation	ObjectBar Theme Pack
13	OBR	Micro Focus International plc	Borland C++ Object Browser Data
14	OBX	IBM	Rational XDE
15	OCR	Nuance Communications	FAXGrapper Fax Text Format
16	OCX	Microsoft	ActiveX Control
17	ODC	Microsoft	Office Data Connection Format
18	ODEX	Google Inc.	Google Android Optimized Executalbe
19	ODF	Oracle	OpenDocument Formula
20	ODG	OASIS	OpenDocument Graphic Format
21	ODI	OASIS	OpenDocument Image
22	ODL	Microsoft	Object Description Language Format
23	ODM	OverDrive	OverDrive Media Format
24	ODO	iCUBE Network Solutions	Online Operating System Write Document
25	ODP	Oracle	OpenDocument Presentation
26	ODS	Oracle	OpenDocument Spreadsheet
27	ODT	Oracle	OpenDocument Text Document
28	ODT#	N/A	Generic
29	ODTTF	Microsoft Corporation	Microsoft Office Document Embedded Font
30	OEACCOUNT	Microsoft	Windows Mail Account Format
31	OER	N/A	AU OER TOOLS project
32	OFC	Microsoft	Open Financial Connectivity Format
33	OFF	N/A	Object Format
34	OFFSETS	N/A	Offset
35	OFM	Melco	Melco Embroidery Format
36	OFN	Microsoft Corporation	MS Office Format New (Other Office Documents)
37	OFR	OptimFROG	OptimFROG Audio Format
38	OFT	Microsoft	Outlook Format Template
39	OFX	N/A	Open Financial Exchange Format
40	OGA	Xiph	Ogg Vorbis Audio Format
41	OGEX	N/A	Open Game Engine Exchange data
42	OGG	Xiph	Ogg Vorbis Audio Format
43	OGM	OriginLab	Ogg Media Format
44	OGNC	N/A	Dynamic Web Page
45	OGR	N/A	OGR C++ Open Source Library
46	OGV	Xiph	Ogg Video Format
47	OKT	N/A	Oktalyzer Module
48	OL	Valve Corporation	Valve Hammer Object Layout
49	OLB	Microsoft	OLE Object Library
50	OLE	Microsoft Corporation	Microsoft Object Linking And Embedding
51	OLK	Microsoft	Outlook Address Book Format
52	OLK14	N/A	Microsoft Outlook for Mac message
53	OLK14CATEGORY	Microsoft	Outlook Category Format
54	OLK14CONTACT	Microsoft	Outlook Contact Format
55	OLK14DBHEADER	Microsoft Corporation	Microsoft Outlook 2011 For Mac Database
56	OLK14EVENT	Microsoft	Outlook Calendar Event Format
57	OLK14EXMOVES	N/A	Microsoft Outlook 2011 for Mac data
58	OLK14EXSYNCMAP	N/A	Microsoft Outlook 2011 for Mac data
59	OLK14FOLDER	Microsoft Corporation	Microsoft Outlook 2011 For Mac Folder
60	OLK14IMAPSYNCMAP	N/A	Microsoft Outlook 2011 for Mac data
61	OLK14MAILACCOUNT	Microsoft	Outlook Mail Account Format
62	OLK14MESSAGE	Microsoft	Outlook Message Format
63	OLK14MSGATTACH	Microsoft Corporation	Microsoft Outlook 2011 For Mac Message Attachment
64	OLK14MSGSOURCE	Microsoft	Outlook Email Message Data Format
65	OLK14PREF	Microsoft	Outlook Preferences Format
66	OLK14RECENT	Microsoft Corporation	Microsoft Outlook 2011 For Mac Recent Address
67	OLK14RULE	Microsoft Corporation	Microsoft Outlook 2011 For Mac Rule
68	OLK14SCHEDULE	Microsoft Corporation	Microsoft Outlook 2011 For Mac Schedule
69	OLK14SEARCH	Microsoft Corporation	Microsoft Outlook 2011 For Mac Saved Search
70	OLK14SIGNATURE	Microsoft	Outlook Signature Format
71	OLK14UID	Microsoft Corporation	Microsoft Outlook 2011 For Mac UID
72	OLK15MESSAGE	N/A	Microsoft Outlook for Mac message
73	OLM	Microsoft	Mac Outlook Database Format
74	OLS	Microsoft Corporation	Microsoft Office List Shortcut
75	OMA	Sony	Sony OpenMG Music Format
76	OME	N/A	Generic
77	OMF	Avid Technology	Open Media Framework Format
78	OMFI	N/A	Open Media Framework
79	OMN	N/A	Omnipotent Collection
80	OMOD	N/A	Oblivion Mod Archive
81	ONE	Microsoft	OneNote Document
82	ONECACHE	Microsoft Corporation	Microsoft OneNote Cache
83	ONEPKG	Microsoft	Microsoft OneNote Package Format
84	ONEPKG_1033	N/A	Microsoft update data
85	ONETMP	Microsoft Corporation	Microsoft OneNote Temporary
86	ONETOC	Microsoft Corporation	Microsoft OneNote Table Of Contents
87	ONETOC2	Microsoft	Microsoft OneNote Table Of Contents Format
88	OOA	N/A	OOA Interchange Format Data
89	OOGL	Geometry Center at the University of Minnesota	Geomview Object Oriented Graphics Library
90	OOS	OpenOffice Project Team	OpenOffice.org Spreadsheet
91	OOT	OpenOffice Project Team	OpenOffice.org Text
92	OPAL	Microsoft Corporation	Microsoft Office Customization Tool (OCT) Language-specific Settings
93	OPAX	Microsoft Corporation	Microsoft Office Customization Tool (OCT) Standard Settings
94	OPENBSD	N/A	OpenBSD Readme Format
95	OPF	IDPF	Open Packaging Format
96	OPLC	Nokia	Nokia Operator Logo Format
97	OPLM	N/A	Outline Processor Markup Language
98	OPML	The Omni Group	Outline Processor Markup Language Format
99	OPPC	Relic Entertainment Inc.	Space Marine Game Resource Package
100	OPS	Microsoft	Office Profile Settings Format
101	OPT	Zeljko Finzgar	MySQL Database Data Format
102	OPUS	Xiph	Opus Audio Format
103	OPX	Insperity Business Services	OrgPlus Org Chart
104	OQY	Microsoft	Excel OLAP Query Format
105	ORC	Voyetra	CSound Orchestra Midi Format
106	ORF	Olympus	Olympus RAW Format
107	ORT	IBM	COREX Orthographic Transcriptions Format
108	OSA	N/A	W32/Sober-AD
109	OSAS	N/A	Apple Script Library Tani Script
110	OSAX	Apple	FindFile OSAX Mac Format Type
111	OSC	Microsoft Corporation	Remote Installation Services Client Installation Wizard Format
112	OSDX	Microsoft	Search Connector Description Format
113	OSG	osg.js	OSGJS JSON Input
114	OSINSTALLMESSAGES	N/A	macOS system data
115	OSM	OpenStreetMap	OpenStreetMap Map Format
116	OSN	N/A	Open Symbolic Notation data
117	OST	Microsoft	Outlook Offline Folder Format
118	OSX	N/A	PowerPC Executable Format
119	OTB	Nokia	Nokia Over The Air Bitmap Image
120	OTC	OASIS	OpenDocument Chart Template
121	OTF	Microsoft and Adobe Systems	OpenType Font
122	OTG	OASIS	OpenDocument Graphic Template
123	OTI	OASIS	OpenDocument Image Template
124	OTS	OASIS	OpenDocument Spreadsheet Template
125	OTT	OASIS	OpenDocument Document Template
126	OUT	N/A	Output Format
127	OV2	TomTom	TomTom Points Of Interest Database
128	OVA	VMware	Open Virtual Appliance
129	OVE	GenieSoft	Overture Musical Score
130	OVF	VMware	Open Virtualization Format
131	OVLX	N/A	Generic
132	OXF	N/A	IBM Rational Rhapsody
133	OXPS	Microsoft	OpenXPS Format
134	OXT	Sun Microsystems	Apache OpenOffice Extension
135	OYZ	dataBased Intelligence, Inc.	Lotus Approach Alternate DBASE Index
136	OZD	N/A	Win32.TrojanDownloader.Agent.OZD trojan

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