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

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