USB Function Class Extension - Windows 10 Service
USB Function Driver Class Extension by Microsoft Corporation.
This service also exists in Windows 11.
Startup Type
| Windows 10 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 1507 | Manual | Manual | Manual | Manual |
| 1511 | Manual | Manual | Manual | Manual |
| 1607 | Manual | Manual | Manual | Manual |
| 1703 | Manual | Manual | Manual | Manual |
| 1709 | Manual | Manual | Manual | Manual |
| 1803 | Manual | Manual | Manual | Manual |
| 1809 | Manual | Manual | Manual | Manual |
| 1903 | Manual | Manual | Manual | Manual |
| 1909 | Manual | Manual | Manual | Manual |
| 2004 | Manual | Manual | Manual | Manual |
| 20H2 | Manual | Manual | Manual | Manual |
| 21H1 | Manual | Manual | Manual | Manual |
| 21H2 | Manual | Manual | Manual | Manual |
| 22H2 | Manual | Manual | Manual | Manual |
Default Properties
| Display name: | USB Function Class Extension |
| Service name: | Ufx01000 |
| Type: | kernel |
| Path: | %WinDir%\system32\drivers\ufx01000.sys |
| Error control: | normal |
| Group: | System Bus Extender |
Default Behavior
The USB Function Class Extension service is a kernel mode driver. If USB Function Class Extension fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the Ufx01000 service has failed to start.
Dependencies
If USB Function Class Extension is stopped, the following services cannot start:
Restore Default Startup Type of USB Function Class Extension
Automated Restore
1. Select your Windows 10 edition and release, and then click on the Download button below.
2. Save the RestoreUSBFunctionClassExtensionWindows10.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer to save changes.
Note. Make sure that the ufx01000.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows 10 installation media.