Chinese font not displayed in gtk app on Windows

[Francois Naggar-Tremblay <frank nt90 gmail com>]

Hi,

I'm using a Chinese handwriting recognition GTK application (http://www.tegaki.org/) on Windows 10. It works well, apart from the fact that every Chinese character is replaced by a rectangle with 4 circles in it and a dot in each circle. Any clue as to why this is happening and how to fix it?

Thank you!