Program to generate chord fingering diagrams?

I have several computer files of songs with the chord names (such as C7 or E flat) above the lyrics. I would like to convert those files to files with the chord diagrams above the lyrics instead of the chord names. There are several DOS based programs that do it at: http://www.jerrydallal.com/UKE.HTM.
Does anyone know of a Windows (for Windows XP) program that will do the conversion if the song file is inputted into the program?
Thanks.
Richard