I saw the EXACT same thing today! I have not yet fully investigated the matter further - I was on my way home when I spotted a method of mine, OpenService, having the name OpenServiceW. I am not 100% sure of what's going on, but it wouldn't surprise me that there's some function in the system headers that looks something like this:
#ifdef _UNICODE
#define OpenService OpenServiceW
#else
#define OpenService OpenServiceA
#endif
If you want to, you can investigate this and post what you find - that ought to be good reading tomorrow morning :) -- I am perpetual, I keep the country clean.