FileViewPro

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

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Compatible met Windows 2000, XP, Vista, 7, 8, 10 en 11