Import old dos sequencial data

I have an old database that stored it's data in a sequencial format with
fixed lengths for each field. As Windows 7 64-bit no longer allows the
running of the database I need to access the data in another way so wish to
import it to excel. I can get as far as marking the first record's field
lengths but there does not seem to be a way of marking the end of the record.
Instead it leaves the rest of the data in the final field!

Can anyone suggest the best way of doing this? Thank you.