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I've installed a barcode reader on a Windows 7 machine: it is configurated with virtual serial port mode.
At the initial moment the driver was not found; looking in the Windows folders I did not find the usbser.sys file.
So I installed the following package:

pkgmgr /ip /m:winemb-inf-mdmcpq.cab

Looking in the Windows folders now I find the usbser.sys in a couple of locations such as System32\DriverStore\FileRepository... and winsxs... folders.
Still the driver for the barcode reader is not found.
I took a look inside the device and it has as compatible IDs:

USB\Class_02&SubClass_02&Prot_01
USB\Class_02&SubClass_02
USB\Class_02

Is it not sufficient to try to locate the usbser.sys driver?

SteMMo
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    It's a small possibility, but this article may be helpful. [Inf file can't find usbser.sys in Windows 7 only](https://stackoverflow.com/q/41928144/9014308) – kunif Oct 12 '20 at 23:44

1 Answers1

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I solved writing a inf file where I specified the USB VID and PID of the device.
In this way the serial driver was loaded and a port number was assigned.

SteMMo
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