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
.O	Microsoft Corporation	開發商檔案	Compiled Object File	Microsoft Visual Studio	Microsoft Corporation
.OBE	SourceForge	開發商檔案	Objeck Executable File	Objeck	SourceForge
.OBR	Micro Focus International plc	開發商檔案	Borland C++ Object Browser Data	Borland C++	Micro Focus International plc
.OCA	Microsoft Corporation	開發商檔案	Custom Control Library Type File	Microsoft Visual Basic	Microsoft Corporation
.OCB	OriginLab	開發商檔案	Origin Precompiled Origin C Source Code	Origin	OriginLab
.OCTEST	Apple	開發商檔案	Xcode Objective-C Unit Test Bundle	Apple Xcode	Apple
.OCX	Microsoft Corporation	開發商檔案	ActiveX Control	Microsoft Visual Studio	Microsoft Corporation
.ODD	Coby Electronics Corporation	開發商檔案	Coby Voice Recorder Data	Coby Voice Manager Software	Coby Electronics Corporation
.ODL	Microsoft Corporation	開發商檔案	Object Description Language File	Microsoft Visual Studio	Microsoft Corporation
.OHI	Borland	開發商檔案	Delphi OpenHelp Index	Delphi (IDE)	Embarcadero Technologies
.OKM	Gian Paolo Saliola	開發商檔案	OkMap Map Defining File	OkMap	Gian Paolo Saliola
.OLT	Innoshock	開發商檔案	Orbit Downloads List	Orbit Downloader	Innoshock
.OM	Petter Strandmark	開發商檔案	Omicron Compiler	Omicron	Petter Strandmark
.OMO	Open Source	開發商檔案	OMake Object File	OMake	Open Source
.OOM	SAP	開發商檔案	PowerDesigner Object-Oriented Model	Sybase PowerDesigner	SAP
.OPR	OPRO Japan Co.	開發商檔案	OPRO Print Report	OPRO X Browser	OPRO Japan Co.
.OPT	LexisNexis	開發商檔案	Concordance Database File	LexisNexis Concordance	LexisNexis
.OPV	Free Software Foundation	開發商檔案	OpenPanorama Visit Data	OpenPanorama Package Manager	Free Software Foundation
.ORC	Voyetra Turtle Beach	開發商檔案	Voyetra Digital Orchestrator File	Digital Orchestrator	Voyetra Turtle Beach
.ORDEREDTEST	Microsoft Corporation	開發商檔案	Visual Studio Ordered Test File	Microsoft Visual Studio	Microsoft Corporation
.OS	Open Source	開發商檔案	ObjectScript Source File	ObjectDevel	Open Source
.OSC	OpenStreetMap	開發商檔案	OpenStreetMap Change File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OW	Open Source	開發商檔案	Free Pascal 1.0.x Object File	Free Pascal	Open Source
.OWL	Interscape	開發商檔案	OWL Source Code File	OWL	Interscape
.OX	Open Source	開發商檔案	Ox Source Code	OX Professional	Open Source

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