Font not showing in Windows 8 app

A few weeks ago, I had to integrate some fancy fonts in an app. Out of the 10 fonts, 1 or 2 had some problem : they didn’t show on the screen. Instead I had the regular font. The problem was the family name. I checked the family name with the font installer software : So I put it in my C# like this : DestinationTextBox.FontFamily = new FontFamily("/Assets/Ming [...]