There was once an excellent desktop software package called FontLab, which was the best professional tool you could get for creating new Windows fonts or tweaking old ones. Now FontLab has finally been updated, indeed completely overhauled, and released as FontLab VI. Regrettably the new cost is a glyph-curling $689, but if you purchased FontLab 5 (way back when Windowsaurii roamed the steaming primeval swamps of the Interwebs) an upgrade is a more feasible $199.
