Stm32 Virtual Com Port Device Driver For Mac Download
Those strings are indeed coded in the file usbdesc.c from the ST USB-Library. Windows sometimes does not detect the change in your device descriptors, since the device USB descriptors are saved in the system the first time you connect the device.
Stm32 Driver Download
When you plug the device again Windows checks its Vid/PID (Vendor ID - Product ID) and uses what it already knows about the device. When Windows doesn't recognize the modification.
You should try to assign another VID/PID to the device or delete the device instance from the device manager (right click-uninstall) and then plug the device again.