USB Function Class Extension (Ufx01000) Service Defaults in Windows 11
Default Settings
| Startup type: | Manual |
| Display name: | USB Function Class Extension |
| Service name: | Ufx01000 |
| Service type: | kernel |
| Error control: | normal |
| Group: | System Bus Extender |
| Path: | %SystemRoot%\system32\drivers\ufx01000.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ufx01000 |
Default Behavior
USB Function Class Extension is a kernel driver. In Windows 11 it starts only if the user, an application or another service starts it. If USB Function Class Extension fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the Ufx01000 service startup failure.
Dependencies
If USB Function Class Extension doesn't work properly, the following services will not start:
Restore Default Startup Configuration of USB Function Class Extension
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config Ufx01000 start= demand
3. Close the command window and restart the computer.
The Ufx01000 service is using the ufx01000.sys file that is located in the C:\Windows\system32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.