Hi Zigmat!
Very cool that you got it going under linux! Yes we have a windows driver, and I need to get that up on the documentation page asap. In the meantime you can get it here: https://s3.amazonaws.com/spark-website/spark_core.inf
This driver is really simple (I recommend opening it in a text editor). All it does is tell Windows the core can be treated as a virtual com port. You might see a giant scary warning dialog when installing it, but you can open it and see it’s not doing anything weird. 
I’ll be adding a nice guide with pictures and stuff, but you should be able to install it by selecting “Update Driver” for the core, and browsing to your downloads directory and it should find it.
Thanks!
David