'Options'-'Window font': call of setup for using user PCF-font in interface. If enabled - interface uses PCF-font, loaded from JAR-file of paintcad, and named as 'arial14.png'. If you want to change this font - repack on computer 'PaintCAD.jar' with other PCF-font, by which you need to replace old 'arial14.png' in JAR. p.s. JAR - it is simple ZIP-archive =) Unpack. Replace file arial14.png by other font. Pack to PaintCAD.jar. WARNING: Enabled 'Window font' needs an extra memory, and smaller amount of memory will available for work of paintcad as picture editor.