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延期	檔案類型開發人員	檔案類別	檔案類型描述	軟體	軟體開發人員
.O1	Open Source	資料檔案	Object File For GO321v1 Platform	Free Pascal	Open Source
.OBJ	Wavefront Technologies	三維圖像檔案	Wavefront 3D Object File	MeshLab	Open Source
.OBML	Opera Software	網絡文件	Opera Mini Saved Web Page	MicroEmulator	Open Source
.OBML16	Opera Software	網絡文件	Opera Mini Saved Web Page	MicroEmulator	Open Source
.OBS	Department of Wind Energy at the Technical University of Denmark, Denmark	資料檔案	WAsP Obstacle List Data	Open Broadcaster Software	Open Source
.OBT	Open Source	設置檔案	Openbox Theme File	Openbox	Open Source
.OCSP	Open Source	資料檔案	HAProxy OCSP Data File	HAProxy	Open Source
.OCT	Radiance Community	三維圖像檔案	Radiance Octree File	RADIANCE	Open Source
.ODD	Coby Electronics Corporation	音頻檔案	Coby Voice Recorder Data	TEI Tools	Open Source
.ODF	Oracle Corporation	不常見的文件	OpenDocument Formula	AbiWord	Open Source
.ODM	Open Source	文字檔	OpenDocument Master Document	AbiWord	Open Source
.ODR	Open Source	資料檔案	OpenIV Model Data	OpenIV	Open Source
.ODT	Oracle Corporation	文字檔	OpenDocument Text Document	AbiWord	Open Source
.OEB	IDPF (International Digital Publishing Forum)	電子書文件	Open eBook File	Calibre	Open Source
.OEM	Microsoft Corporation	設置檔案	Original Equipment Manufacturer Setup File	OEM Information Editor	Open Source
.OFF	Open Source	三維圖像檔案	Object File Format	MeshLab	Open Source
.OFX	Intuit, Inc.	資料檔案	Open Financial Exchange File	GnuCash	Open Source
.OGA	Xiph.Org	音頻檔案	Ogg Vorbis Audio File	IrfanView	Open Source
.OGG	Xiph.Org	音頻檔案	Ogg Vorbis Audio File	IrfanView	Open Source
.OGX	Xiph.Org	視頻檔案	Ogg Vorbis Multiplexed Media File	XMMS	Open Source
.OIV	Open Source	插件檔案	OpenIV Mod Package File	OpenIV	Open Source
.OKT	Open Source	音頻檔案	Oktalyzer Module	ModPlug Player	Open Source
.OMO	Open Source	開發商檔案	OMake Object File	OMake	Open Source
.OO	Open Source	不常見的文件	Free Pascal Object File For OS/2 Version	Free Pascal	Open Source
.OOA	Sublime HQ Pty Ltd	資料檔案	OOA Interchange Format Data	PSPad	Open Source
.OP	Open Source	資料檔案	OpenPAT Report	OpenPAT	Open Source
.OPML	The Omni Group	網絡文件	Outline Processor Markup Language File	OPML Editor	Open Source
.OPT	LexisNexis	資料庫檔案	Concordance Database File	AGiliTy	Open Source
.OPUS	Open Source	音頻檔案	Opus Audio File	MediaInfo Player	Open Source
.OS	Open Source	開發商檔案	ObjectScript Source File	ObjectDevel	Open Source
.OSC	OpenStreetMap	GIS檔案	OpenStreetMap Change File	osmchange	Open Source
.OSZ	Ppy Pty Ltd	遊戲檔案	Osu! Beatmap File	opsu!	Open Source
.OTD	Open Source	遊戲檔案	OpenIV Texture Data	OpenIV	Open Source
.OTF	Open Source	字體檔案	OpenType Font	FontForge	Open Source
.OTRKEY	OnlineTvRecorder.com (OTR)	視頻檔案	OnlineTvRecorder Encoded Video File	otrtool	Open Source
.OUT	Open Source	可執行檔案	Compiled Executable File	Linux	Open Source
.OW	Open Source	開發商檔案	Free Pascal 1.0.x Object File	Free Pascal	Open Source
.OX	Open Source	開發商檔案	Ox Source Code	OX Professional	Open Source
.OXO	Open Source	設置檔案	Ox Object-oriented Matrix Programming Language Source Code	OX Professional	Open Source

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