This page provides a list of those file extensions that start with .u. The information given below is a summary and further details can be found by clocking on the summary next to the file extension of interest.

.ucfUser Constraint File | Coordinate list file | WebEx Universal Communications file.
.udfUniqueness definition file.
.udlData link file.
.uhaUHARC compressed archive.
.urlInternet shortcut file.
.userVisual Studio user options file.
.uspNmap scan profile file.
.usrUser profile file for GuildFTPD
.utfUlead Video Studio subtitle file.
.uueUU-encoded file.

For further information about the file extension please do click on the summary next to the file extension in the list above.

We would like this listing to be complete and comprehensive, but recognised that we may have missed one and that new file types are being used all the time. So if you know of a file type that we have missed that should be listed here then please let us know.