Extension	File Type Developer	File Category	File Type Description	Primary Software	Primary Software Developer
.U3I	Interscape	Text Files	U3 Application Information File	U3 Launcher	Interscape
.UDF	Open Source	Text Files	Universal Disk Format Image File	7-Zip	Igor Pavlov
.UNX	Unknown Developer	Text Files	Unknown Apple II File. (found On Golden Orchard Apple II CD Rom)	Atom	GitHub, Inc.
.UOF	The Document Foundation	Text Files	Uniform Office Document	Apache OpenOffice	Apache Software Foundation
.UPD	Various Developers	Text Files	Program Update Information	Microsoft Notepad	Microsoft Corporation
.UPDF	Software995	Text Files	UltraPdf Publication File	UltraPdf	Software995
.UPM	Livescribe	Text Files	PenMail Document	PenMail	Livescribe
.USE	Unknown Developer	Text Files	Log File	Microsoft Notepad	Microsoft Corporation
.UTXT	Open Source	Text Files	Unicode Text File	Microsoft Notepad	Microsoft Corporation

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