USB Function Class Extension (Ufx01000) Service Defaults in Windows 10

USB Function Driver Class Extension by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:USB Function Class Extension
Service name:Ufx01000
Service type:kernel
Error control:normal
Group:System Bus Extender
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ufx01000

Default Behavior

USB Function Class Extension is a kernel device driver. In Windows 10 it is starting only if the user, an application or another service starts it. If USB Function Class Extension fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the Ufx01000 service has failed to start due to the error.


While USB Function Class Extension is stopped, disabled or working incorrectly, the following services do 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 10 installation media.