[bcab] Confused about Daisy format

Hi folks

I've just joined the RNIB talking book Library as I now find they produced 
digital audio books in daisy format.

Now, I'm lead to beleive that daisy formated books have to be played on a 
compatible daisy player.

So, how come when I get my first books, I see that they are in fact mp3 files 
and I can play them fine in winamp and my mp3 compatible hifi system?

Don't get me wrong, I'm not complaining, I think it's great, I'm just a bit 
bemused.

Darren

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