Why some fonts not available in "Display Properties" dialog?

[Guest hello]

Control Panle -> Display -> Appearance -> Advanced,

In my "Fonts" folder, there are many fonts, but most of them are unavailable

in above dialog. I tried to write the font manually, but it does not work.

So, my question is,

 

1, How to use other fonts in this dialog?

2, And, why is the font field writable?

 

Thank you.