Microsoft Vector Font Format
Microsoft Vector Font Format, known in the files as "continuous scaling," is a vector font format developed by Microsoft in 1985 for Windows 3. These font files have the same MZ signature as Microsoft executables, but use a *.fon extension. The same file extension and signature is used by Microsoft bitmap fonts, but the bitmap format is different enough to warrant its own page.
Although the font format was designed for Windows, some DOS programs have made us of it over the years. The format was also included in the Windows installer of later DOS games.