In the download area there is a VCP Driver for Windows. For the moment, my application communicates by physical COM port not available at many new laptops. Therefore, my board already has a USB socket. As far as I understand, the STM32 app has to show a behaviour of a CDC.
Unfortunately, I did not find any application note or firmware example on how to program the enumeration and Rx/Tx of such CDC using the Std_PeriphLib.