Examining font properties under Windows

Here's a simple question: how do I find whether a face is bold? How about italic? Under X11, I can examine (font-instance-properties (face-font-instance face)). Then, if the property `WEIGHT_NAME' equals "Bold", the face is probably bold. If 'SLANT equals "i" or "o", the face is for my purposes italic. I have a strange feeling that this doesn't work on non-X11 devices. It might even failed under X11-based devices that provide their own font model (Qt?), under the condition that XEmacs actually uses it. So my question is: what does `font-instance-properties' return under Windows? If the answer is "nothing" or "nothing useful", is there another way to detect boldness etc.?