To install the sceregvl.inf file you need to take the following steps:

On the system you will edit your group policy on, Open a Windows Explorer window
1. Open an elevated command prompt
2. Run this command: takeown %systemroot%\inf\sceregvl.inf
3. Run this command: icacls %systemroot%\inf\sceregvl.inf /grant Administrators:(f)
4. Run this command: ren %systemroot%\inf\sceregvl.inf sceregvl.inf.old
5. Copy sceregvl.inf to the %systemroot%\inf directory and name it sceregvl.inf
6. Run this command: regsvr32 scecli.dll

When you open the group policy editor you will now find a setting in there to manage the filtering of tokens for remote connections using local accounts. A policy you build with that setting will take effect on all Windows Vista systems that receive the policy even if they do not have the new sceregvl.inf file on them. That file is used only to modify the group policy interface, and has no bearing on the application of the policies.