Windows 8.1: WinUSB.sys for service 'WinUsb' is not present.

Hi,
we have an application that communicates via WinUSB with its device. WinUSB is installed via custom .inf.
Two Windows 8.1 users report an issue where WinUSB can’t be installed. The install log reads:
inf:
AddService=WinUsb,0x000001fa,WinUsb_ServiceInstall (winusb.inf line 31)
!!! dvi: Add Service: Binary
‘C:\Windows\system32\DRIVERS\WinUSB.sys’ for service ‘WinUsb’ is not
present.

Other than that there are several thousand installation without the issue. The inf reads:
[Version]
Signature= “$WINDOWS NT$”
Class= MEDIA
ClassGUID= {4d36e96c-e325-11ce-bfc1-08002be10318}
Provider= %VENDOR%
CatalogFile= %DRIVER%.cat
DriverPackageDisplayName= %VENDOR% %DEVICE%
PnpLockDown= 1

[Manufacturer]
%VENDOR%= devices, NT$ARCH$

[devices.NT$ARCH$]
%DEVICE%= DeviceInstall, USB\VID_xxxx&PID_xxxx&MI_xx

[DeviceInstall]
Include= winusb.inf
Needs= WINUSB.NT

[DeviceInstall.Services]
Include= winusb.inf
Needs= WINUSB.NT.Services
AddService= WinUsb, 0x000001fa, WinUsb_ServiceInstall

[DeviceInstall.HW]
AddReg= DeviceInstall.AddReg

[DeviceInstall.AddReg]
HKR, DeviceInterfaceGUIDs, 0x10000, “{fbd8de61-48b4-4072-9a00-2bb4ac85aabf}”

[WinUsb_ServiceInstall]
DisplayName= %DEVICE%
ServiceType= 1
StartType= 3
ErrorControl= 1
ServiceBinary= %12%\WinUSB.sys

[Strings]
VENDOR=“me”
DRIVER=“MyWinUSB”
DEVICE=“My Device”

Any hint where to look or idea what could have went wrong, or even just a workaround for the user is highly appreciated!
Thanks,
Hagen.

%VENDOR%= devices, NT$ARCH$
[devices.NT$ARCH$]

The inf really has these lines? Hmm.

Well, it can be assumed that it had these lines before getting architecture-customized. Of course after customization, stampinf, etc. it reads (for x86_64):
[Version]
Signature= “$WINDOWS NT$”
Class= MEDIA
ClassGUID= {4d36e96c-e325-11ce-bfc1-08002be10318}
Provider= %VENDOR%
CatalogFile= %DRIVER%.cat
DriverPackageDisplayName= %VENDOR% %DEVICE%
PnpLockDown= 1
DriverVer=11/18/2020,1.5.1.188

[Manufacturer]
%VENDOR%= devices, NTamd64

[devices.NTamd64]

The install log reads:
AddService=WinUsb,0x000001fa,WinUsb_ServiceInstall (winusb.inf line 31)

You didn’t literally call your inf file “winusb.inf”, did you? Did you not notice there is already a “winusb.inf”? Your winusb drivers are supposed to use Needs and Include to bring in the standard winusb.inf. https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/winusb-installation

You’re sure both of those users were on Windows 8.1? In Windows 7, WinUSB did not ship with the operating system, so your driver package would have to use the co-installers. It should be included in Windows 8.

Thanks, Tim,
winusb.inf - good point! But doesn’t it end up as oemxx.inf anyways. I will see if this improves anything.
And yes, its 8.1 thats why I am posting here.