It's pitty that you stopped supporting Windows 98.
The current veriosn for Win98 lacks some important improofments
So I would ask you to consider to support window 98 again.
Allthough it's somewhat more difficult to develop using Unicode for win98, it is possible.
Another option is to write your code in a way that it can be compiled with and without Unicode support.
MP3Tag is a great tool. Í'm very sad that I can't use the latest version under windows98.
With Kind regards