Disklavier

Hi everybody,
I just purchased a 1997 Yamaha GH1 w/Disklavier DKC100R in perfect 
condition.  It can only handle the PianoSOLO disks.  No speaker.
I paid $12,800.
My first question is, is that a good deal?  I initially thought yes 
till I read that some of you paid as low as $19,000 for a new 
MarkIII.

My next questions have to do with recording and sharing and what is 
legal and what is not.
I just popped one of the floppy disks that were included with my 
purchase and my XPpro machine just says I need to format the disk.
I saw the posts regarding 2DD and 2HD and how to format an HD to be 
a DD.

Does my inability to read these disks in XP have something to do 
with the DD format? Would a win98 machine read the disks?

If a friend made a recording on his disklavier and emailed it to me 
would I be able to copy it to a floppy and listen to it?

What format are the pianoSOLO disk files in?(since I can't read them 
myself)

When I was looking to make the purchase I figured there would be a 
lot of people sharing their own recordings for free.  Not having 
much luck googling.
I noticed people here posted a bunch of midi files.(I like the 
blues, jazz, and ragtime midis).
If I copied the files to floppy would it play on my disklavier even 
tho I don't have midi capability?  I know the answer seems obvious, 
but I'm hoping. :)

and my last question, for now ;),
Is making backups of these floppies legal?

I have a bunch of old floppies that dont work anymore, I figured the 
same will happen to these, so I'd like to back up the disks(since 
they cost $30) and stick them on CD for storage.

Is it legal?  Is it possible?  Do I need to have a 98 machine?