Files with the FON extension identify font files used in the Microsoft Windows 3.x operating platform. FON files contain various font data that is used to display text in the Windows environment. FON files are composed of binary data in an algorithm and template format. FON files may be opened and edited with the compatible software.
The FON file extension is commonly used for default Microsoft Windows bitmap fonts. Some of these are loaded in the system when the OS is installed and more can be added through the Fonts Control Panel. A FON font is a bitmap format with fixed size. These files are used in Microsoft Windows since version 3.11 and are still present in he latest Windows 7,