Okay I did a search for sysoc and found sysocmgr. That's the only file even close with the name or sysoc in it. Anyways, I tried opening it and I get this screen with the title, "Windows XP Setup". Then it says. "Invalid program arguments were specified", with a list of commands I could type and an "OK" button at the bottom.
Open windows explorer> tools> folder options> 'view' tab> tick 'show hidden files and folders,' untick 'hide protected operating system files (recommended)', and untick 'hide extensions for known file types.' Then navigate to the WINDOWS\inf folder and look for the sysoc.inf file.
It's a hidden, system file is why you can't find it.