error in restore native 3.70B database

Hallo everyone,

I'm new to this community and I have the following problem: I have only a backup (fbk) from our previous Navision system (3.70B native)
when I try to do a restore (into a new native database created with a 3.70B client) at the very end I get "error 1190 in module 9 Table Customer"
the result is that I can not do anything
doing a full test database results in the same error
my restore machine has the same codepage settings as the machine the backup was made
I do not have the original database anymore

I also tried to do a restore into a new created databse on a SQL2000 and the restore stopped with "The Customer table contains a value in a Code field that cannot be used with Microsoft Business Solution-Navision"

what can I do?

Thanks