FileViewPro

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

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