Invalid?? It works for me
You can use the ditor without it but you won't see the caracters => =/= >= and =<
I'll check it tomorrow
P.S. : Thanks 
EDIT : In fact it's a problem when I uploaded it :/
I can't try again right now. I'll do it tomorrow
<{POST_SNAPBACK}>
I tried it on my home computer, same thing. It probably was an upload issue.
BTW, If you can use a unicode font in the editor you'll have access to almost all of the special ClassPad characters (with exception of the goofy character used for the Setting menu

). I believe WxWidgets supports unicode. I can give you a translation table to translate unicode to the classpad multibyte characters.
The one possible problem, I don't think Windows 98 has strong unicode support. I'm not sure if WxWidgets works around this.
The screenshots look like it was developed on the Mac. Do you plan on having a Mac version?