FileViewPro

Estensione	Sviluppatore del Tipo di File	Categoria File	Descrizione del Tipo di File	Software Principale	Sviluppatore del Software Primario
.OAS	Fujitsu Limited	File di testo	Fujitsu OAS Document File	OASYS Viewer	Fujitsu Limited
.OCR	URUWORKS	File di testo	Subtitle Workshop OCR Script	URUWorks Subtitle Workshop	URUWORKS
.ODIF	ITU-T (International Telecommunication Union, Telecommunication Standardization Sector)	File di testo	Open Document Interchange Format	Unknown Software	Unknown Developer
.ODM	Open Source	File di testo	OpenDocument Master Document	Apache OpenOffice	Apache Software Foundation
.ODT	Oracle Corporation	File di testo	OpenDocument Text Document	Apache OpenOffice	Apache Software Foundation
.OLI	Olivetti	File di testo	Olivetti Text File	Olitext Plus	Olivetti
.OMN	Unknown Developer	File di testo	Omnipotent Collection Data	Unknown Software	Unknown Developer
.OPT	LexisNexis	File di testo	Concordance Database File	LexisNexis Concordance	LexisNexis
.ORO	The Three-Mode Company	File di testo	3WayPack T3Rotate Output	3WayPack	The Three-Mode Company
.OSC	OpenStreetMap	File di testo	OpenStreetMap Change File	Merkaartor	Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others
.OTT	Apache Software Foundation	File di testo	OpenDocument Document Template	Apache OpenOffice	Apache Software Foundation

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