Consider the following scenario:

• In an Active Directory domain environment, you configure users in the domain to use a roaming user profile.
• You enable the Process even if the Group Policy objects have not changed option for some Group Policy objects in the domain.
• The user profile on the profile server contains read-only files.

In this scenario, when a domain user logs off from a Windows Vista-based client computer, some redundant files that are named Prfx.tmp may be generated in the user profile folder on the profile server.