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Extensão	Desenvolvedor de Tipo de Arquivo	Categoria do Arquivo	Descrição do Tipo de Arquivo	Software	Desenvolvedor de Software
.O1	Open Source	Arquivos de dados	Object File For GO321v1 Platform	Free Pascal	Open Source
.OBJ	Wavefront Technologies	Arquivos 3D	Wavefront 3D Object File	MeshLab	Open Source
.OBML	Opera Software	Arquivos Web	Opera Mini Saved Web Page	MicroEmulator	Open Source
.OBML16	Opera Software	Arquivos Web	Opera Mini Saved Web Page	MicroEmulator	Open Source
.OBS	Department of Wind Energy at the Technical University of Denmark, Denmark	Arquivos de dados	WAsP Obstacle List Data	Open Broadcaster Software	Open Source
.OBT	Open Source	Arquivos de configuração	Openbox Theme File	Openbox	Open Source
.OCSP	Open Source	Arquivos de dados	HAProxy OCSP Data File	HAProxy	Open Source
.OCT	Radiance Community	Arquivos 3D	Radiance Octree File	RADIANCE	Open Source
.ODD	Coby Electronics Corporation	Arquivos de áudio	Coby Voice Recorder Data	TEI Tools	Open Source
.ODF	Oracle Corporation	Arquivos miscelâneas	OpenDocument Formula	AbiWord	Open Source
.ODM	Open Source	Arquivos de Texto	OpenDocument Master Document	AbiWord	Open Source
.ODR	Open Source	Arquivos de dados	OpenIV Model Data	OpenIV	Open Source
.ODT	Oracle Corporation	Arquivos de Texto	OpenDocument Text Document	AbiWord	Open Source
.OEB	IDPF (International Digital Publishing Forum)	Arquivos eBook	Open eBook File	Calibre	Open Source
.OEM	Microsoft Corporation	Arquivos de configuração	Original Equipment Manufacturer Setup File	OEM Information Editor	Open Source
.OFF	Open Source	Arquivos 3D	Object File Format	MeshLab	Open Source
.OFX	Intuit, Inc.	Arquivos de dados	Open Financial Exchange File	GnuCash	Open Source
.OGA	Xiph.Org	Arquivos de áudio	Ogg Vorbis Audio File	IrfanView	Open Source
.OGG	Xiph.Org	Arquivos de áudio	Ogg Vorbis Audio File	IrfanView	Open Source
.OGX	Xiph.Org	Arquivos de vídeo	Ogg Vorbis Multiplexed Media File	XMMS	Open Source
.OIV	Open Source	Arquivos de complementos	OpenIV Mod Package File	OpenIV	Open Source
.OKT	Open Source	Arquivos de áudio	Oktalyzer Module	ModPlug Player	Open Source
.OMO	Open Source	Arquivos de desenvolvedor	OMake Object File	OMake	Open Source
.OO	Open Source	Arquivos miscelâneas	Free Pascal Object File For OS/2 Version	Free Pascal	Open Source
.OOA	Sublime HQ Pty Ltd	Arquivos de dados	OOA Interchange Format Data	PSPad	Open Source
.OP	Open Source	Arquivos de dados	OpenPAT Report	OpenPAT	Open Source
.OPML	The Omni Group	Arquivos Web	Outline Processor Markup Language File	OPML Editor	Open Source
.OPT	LexisNexis	Arquivos de banco de dados	Concordance Database File	AGiliTy	Open Source
.OPUS	Open Source	Arquivos de áudio	Opus Audio File	MediaInfo Player	Open Source
.OS	Open Source	Arquivos de desenvolvedor	ObjectScript Source File	ObjectDevel	Open Source
.OSC	OpenStreetMap	Arquivos GIS	OpenStreetMap Change File	osmchange	Open Source
.OSZ	Ppy Pty Ltd	Arquivos de jogos	Osu! Beatmap File	opsu!	Open Source
.OTD	Open Source	Arquivos de jogos	OpenIV Texture Data	OpenIV	Open Source
.OTF	Open Source	Arquivos de fonte	OpenType Font	FontForge	Open Source
.OTRKEY	OnlineTvRecorder.com (OTR)	Arquivos de vídeo	OnlineTvRecorder Encoded Video File	otrtool	Open Source
.OUT	Open Source	Arquivos executáveis	Compiled Executable File	Linux	Open Source
.OW	Open Source	Arquivos de desenvolvedor	Free Pascal 1.0.x Object File	Free Pascal	Open Source
.OX	Open Source	Arquivos de desenvolvedor	Ox Source Code	OX Professional	Open Source
.OXO	Open Source	Arquivos de configuração	Ox Object-oriented Matrix Programming Language Source Code	OX Professional	Open Source

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