Simply Account Database on XP to SAGE 50 Win 10 x64

Hi,

Apparently Simply Accounting 2010 backups have not been done, we have the actual "live" database installed on XP, we moved it to a new Win 10 x64 station, all works but when we try to upgrade to a newer SAGE50 version, we always get a popup saying that  "File Cannot be Opened" after conversion process.We cannot maintain the databse in SA2010 either..we can restore an old backup to the new SAGE50 installation but all fails with the SA2010 live database..

I'm out of ideas :( please help