With CreateFont one can specify font name and a bunch of other properties. However, what if I have a font.ttf file, and I want that particular font to be loaded by windows? How do I specify that specific file to be used?
I'm pretty sure you can't. All requests for fonts go through the font mapper, and it picks out the font file that comes the closest to meeting the specifications you've given. Though I'm not sure it even does in reality, it could at least theoretically use (for example) data from two entirely separate font files to create one logical font.