How do you save as .fon and .otf?

[ErwinDenissen]

@Bhikkhu Pesala

You can edit and create Truetype fonts, but you can only edit OpenType fonts.

Actually FontCreator is no longer able to create TrueType fonts, that technology is superseded by OpenType. For some reason the file extension is still .ttf, and Windows incorrectly identifies these OpenType fonts as TrueType fonts. More information about this can be found here.

@Bhikkhu Pesala

To add OpenType features to a font requires third party software such as VOLT or OpenType Compiler.

That’s correct. FontCreator can only make basic OpenType fonts. To make OpenType fonts with advanced (layout) features you’ll need additional software. Both VOLT (from Microsoft) and OpenType Compiler (from Rogier van Dalen) are free and will do the trick.