Does anyone know this 90's kids' PC game called Spellbound where you collect letters with different vehicles?

Back in the late 90's/early 00's, we used to play this game in computer class called Spellbound. But unfortunately I can't find a single trace of this game online. I wasn't expecting to find somewhere to download/play it or anything, but I was sure I'd at least find some screenshots or something, some proof that this game did at least exist. I'm 100% positive it was called Spellbound, I even asked my brother the name of it and he confirmed it was called Spellbound.

I can remember this game clearly. It was a 2D game where you controlled a little cartoonish vehicle that could transform into different vehicles depending on the level it's in, I can distinctly remember a submarine for underwater levels and a helicopter (or possibly an airplane) for sky levels. Whether or not it was a submarine underwater or a helicopter/plane in the sky, the controls of the game were the same. You could move the vehicle in any direction (up, down, left and right) in order to navigate through the level, dodging enemies and collecting letters of the alphabet. Once you collected all the letters in the level, they would spell out a word (so the game was somewhat educational, helping kids learn to spell). The length of the word would increase as you progressed through the levels, making the word more difficult to spell as well as making the game more difficult since it meant you had to collect more letters.

Does anyone have any information on this game, the designer/publisher or anything? Thank you