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

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