It's a ".sys" file but it's not a driver binary at all. It's a binary configuration file, and from what I gather it's a sort-of packed table. The actual kernel

It's a ".sys" file but it's not a driver binary at all. It's a binary configuration file, and from what I gather it's a sort-of packed table. The actual kernel driver mounts it, parses the contents, and uses it as configuration. The ".sys" extension is probably for the believability of being a driver so users would leave it alone.