Files with utf file extension are related to apps developed by AOL. A utf file contains update.
UTF file extension - AOL update data
What is utf file? How to open utf files?
File type specification:
The utf file extension is used by some software developed by AOL (also known as America Online) company.
These utf files can be found in the "Tools on Demand" folder and contains update.
This utf file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.