The issue was because the executable files were created in Windows 7.
I recreated them in Windows XP, which should allow them to work now in XP, 2000, Vista, 7, 8...
I've uploaded a preview version here
http://goo.gl/NTMqH9.
Please download it and let me know if it works, before we update the link on RPGNow.
If there is anyone around with a working Win98 who would like to try it as well, and report any findings here, it would be really useful.
Thanks