Microsoft Hyper-V VHDPMEM BTT Filter - Windows 11 Service
This service exists in Windows 11 only.
Startup Type
| Windows 11 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 21H2 | Manual | Manual | Manual | Manual |
| 22H2 | Manual | Manual | Manual | Manual |
| 23H2 | Manual | Manual | Manual | Manual |
| 24H2 | Manual | Manual | Manual | Manual |
Default Properties
| Display name: | Microsoft Hyper-V VHDPMEM BTT Filter |
| Service name: | bttflt |
| Type: | kernel |
| Path: | %WinDir%\System32\drivers\bttflt.sys |
| Error control: | normal |
| Group: | PnP Filter |
Default Behavior
The Microsoft Hyper-V VHDPMEM BTT Filter service is a kernel mode driver. If Microsoft Hyper-V VHDPMEM BTT Filter fails to start, the error is logged. Windows 11 startup proceeds, but a message box is displayed informing you that the bttflt service has failed to start.
Restore Default Startup Type for Microsoft Hyper-V VHDPMEM BTT Filter
Automated Restore
1. Select your Windows 11 edition and release, and then click on the Download button below.
2. Save the RestoreMicrosoftHyperVVHDPMEMBTTFilterWindows11.bat file to any folder on a local drive such as SSD or a hard disk.
3. Right-click the downloaded batch file and select Properties.
4. Check the Unblock checkbox and click OK.
5. Right-click the batch file again and select Run as administrator.
6. Restart the computer to save changes.
Note. Make sure that the bttflt.sys file exists in the %WinDir%\System32\drivers folder. If this file is missing you can try to restore it from your Windows 11 installation media.