I believe it is Adaptec, but what I'm not sure about is that there's a socketed EPROM on the board labeled "Apple" which I expect is some kind of BIOS ROM; if that's necessary, I kind of doubt it'll work on an x86 machine without replacing that.
I used an Adaptec "Apple" PCI SCSI card card in a Windows 2000 Pro work PC for a number of years without problems the only issues was that the Apple EPROM from a PPC mac meant that my x86 PC could not boot off it, but as I was using it to connect a SCSI backup drive and a CD-Writer this was not a problem. It may even have been possible to reflash the card to allow a PC to boot off it but I had no need to so I never tried.
So the odds are reasonable that it will work if you load the correct driver under Windows :-)
