Source (link to git-repo or to original if based on someone elses unmodified work): https://github.com/xoomoh/xfce-xfwm4-theme-windows10
In Windows 10, default font for window captions is Segoe UI 9px. I used Roboto 10px font. But you can use anyone you like.
To change the size of the application icon from 24x24 to 16x16 (as in Windows) edit the menu.xpm file. In the third line, replace 24 with 16.