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

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