Spent a fair bit of time this evening re-testing the SpellEditor, in short, the last release was horribly broken in loads of ways.
I've put another version up now that I've tested works. It loads all 3500 spells, they seem to all have the correct icons in game, new spells show up in game I've tested you can actually cast them.
Import/export has been fixed, old spells in .spell and .spell2 format are now invalid. Import and export of .spell3 files is tested and works. There was a ton of extra data at the end of the spells that isn't listed in the spdat_struct, 28 bytes of it which I was just ignoring. I now read it in and write it out, but don't allow editing of it as it's unknown data.
Hopefully it should be back to it's old functionality now
http://www.geocities.com/Kaiyodouk/
K.