UAC File Virtualization (luafv) Service Defaults in Windows 10

Virtualizes file write failures to per-user locations.

Default Settings

Startup type:Automatic
Display name:UAC File Virtualization
Service name:luafv
Service type:filesys
Error control:normal
Group:FSFilter Virtualization
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\luafv

Default Behavior

UAC File Virtualization is a file system driver. In Windows 10 it is starting automatically when the operating system starts. If UAC File Virtualization fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the luafv service has failed to start due to the error.


UAC File Virtualization cannot be started under any conditions, if the FltMgr service is disabled.

Restore Default Startup Configuration for UAC File Virtualization

1. Select your Windows 10 edition and release, and then click Download.

2. Save the Win10_luafv_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The luafv service is using the luafv.sys file that is located in the %WinDir%\system32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.