.ULS File Extension
File TypeNetMeeting User Location Service File
What is a ULS file?
Contains information about an Internet location; used by Microsoft NetMeeting to connect users to each other; the Internet Locator Server (ILS) sends a file called "Ulserver.uls" to clients with IP address and port information.
NetMeeting was part of Windows XP, but is not included with Windows Vista. It has been replaced by Windows Meeting Space and Microsoft Office Live Meeting.