To save an RFF file currently open in the FONTEDIT iconFONTEDIT Notebook:

Select Save from the File menu or
Select Save As... from the File menu to display a standard 'Save As' dialog. Choose a Save as type option from the drop-down list:
oRFF fonts (*.RFF) – the default
oUFF fonts (*.UFF) – see Example of UFF font
oTrueType fonts (*.TTF, *.OTF)
oAll files

Links

Opening and closing an RFF font file