There is only one file type that uses the .USERPROFILE extension:
Norton AntiVirus User Profile File
File used by Norton AntiVirus, a program used to protect computers from viruses; contains subscription information that may reside on a computer even after Norton AntiVirus has been deleted.
The file MyProfile.UserProfile is a hidden file and can be found in the Application Data\Symantec\Shared user directory. It is also accompanied by a Norton AntiVirus .VCPREF file named Options.VcPref.
NOTE: Norton AntiVirus became Norton Security in 2014.
|Symantec Norton Security||Commercial|
Updated: March 13, 2015