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延期	文件类型开发人员	文件类别	文件类型描述	初级软件	初级软件开发人员
.OBS	Department of Wind Energy at the Technical University of Denmark, Denmark	游戏文件	WAsP Obstacle List Data	WAsP	Department of Wind Energy at the Technical University of Denmark, Denmark
.ODF	Oracle Corporation	游戏文件	OpenDocument Formula	Apache OpenOffice	Apache Software Foundation
.OMOD	Bethesda Softworks	游戏文件	Oblivion Mod Archive	The Elder Scrolls IV: Oblivion	Bethesda Softworks
.OOB	Matrix Games	游戏文件	Steel Panthers World At War Data	Steel Panthers: World At War	Matrix Games
.OPA	Terminal Reality	游戏文件	Fly! RAW Image Opacity Map File	Fly!	Terminal Reality
.OPN	Rebel Software	游戏文件	Rebel Strip Poker Opponent Data	Amature Strip Poker	Unknown Developer
.OPT	LexisNexis	游戏文件	Concordance Database File	LexisNexis Concordance	LexisNexis
.ORE	Crait Corp.	游戏文件	Ore Executable File	Ore Runtime Environment	Jonathan Holmes
.ORI	Unknown Developer	游戏文件	Original File	Unknown Software	Unknown Developer
.ORK	Relic Entertainment	游戏文件	Warhammer Mark Of Chaos Game Archive	Warhammer 40K Dawn of War	Relic Entertainment
.OSC	OpenStreetMap	游戏文件	OpenStreetMap Change File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OSF	Interplay Entertainment	游戏文件	Descent 3 Sound Data	Descent 3	Interplay Entertainment
.OSR	Ppy Pty Ltd	游戏文件	Osu! Game Replay	osu!	Ppy Pty Ltd
.OSZ	Ppy Pty Ltd	游戏文件	Osu! Beatmap File	osu!	Ppy Pty Ltd
.OTD	Open Source	游戏文件	OpenIV Texture Data	OpenIV	Open Source
.OVL	Atari Corporation	游戏文件	Rollercoaster Tycoon 3 Data File	RollerCoaster Tycoon 3	Frontier Developments plc

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