Windows 8.1 taskbar button text font size

I want to increase taskbar button text font size.
In Windows 7 you could select "windows classic" theme increase window caption font size and taskbar button text font size was increased also.
In Windows 8.1 there is no way to do that (no "windows classic" theme, increasing window caption font size has no effect on taskbar button text font size).
Increasing dpi is not an option for me because it stretches everything - icons look pixelated and etc.

Any ideas how to do that ?