I'm asking as I have a thunderbolt (first generation) device currently connected to a (now defective) Mac and I'm looking at switching this to a PC. I'd prefer going through the integrated USB-C port if compatible, rather than adding a Thunderbolt PCIe card, which get mixed reviews.
RE: XPS with USB-C port... compatible with Thunderbolt devices (including previous generations)?
From what I can tell the USB C is a USB 3.1 Gen 2 port so it should work. I didn't find any documentation on it but a quick google search found multiple people using it and the adapter should take care of any cross compatibility issues.