You can change the look of individual characters but don’t change the ascent or descent of the font or the width of characters or you will damage the 'NFNT'. Do you want to edit the 'NFNT'?
The font family resource contains no data and cannot be edited. Use the Get Resource Info command to make changes.
When you edit a FONT on a monitor displaying more than 2 colors or shades, your changes will not be reflected in the sample text.