It acts as a "Big Font" paired with a base font (like txt.shx ) to provide characters that exceed the standard 255-character limit of older SHX formats. Usage & Troubleshooting
Unlike standard TrueType Fonts (TTF) that are vector-based and installed via Windows, Hzdx.shx is a native AutoCAD shape file optimized for CAD performance. Hzdx.shx Font