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@Jean-Philippe_Rey
I tried to get the Pico HID work with Windows (7) , same behaviour, the HID class does not enumerate as well. I wonder if the Device Descriptor field "bDeviceClass" should be set to 0x00 (line 62 of usbd_cdc_hid.c). I read in a (great) document from Cypress those few lines:
"bDeviceClass, bDeviceSubClass, and bDeviceProtocol
are used by the operating system to identify a driver for a
USB device during the enumeration process. Filling in this
field in the device descriptor prevents different interfaces
from functioning independently, such as a composite
device. Most USB devices define their class(es) in the
interface descriptor, and leave these fields as 00h."
The document can be found here: http://www.cypress.com/file/134171/download