Yes, its a Silicon Image (Sil) 3512 SATALink Controller. As I said, the file I have is an exe which when opened in 7zip shows 2 files that can't be opened or unzipped further. I'm not sure yet if Windows Setup will be able to use it or not since it's and exe file.
Edit: Never mind I just checked again in google and found a driver for the 3112 which the readme file describes as 3X12 driver so I'm assuming it works for any 3X12 controller.