Looks like you don't have actual db file in app_Data directory. If you still have host access to your old company.

Try these;

First; Go to hosting company website and checkout what they provide; if they provide backup and download database, then you could take backups of database, this is useful. To do this, you have to login their control panel and look for Backup Database & Download Backups section or something like that.

Second; If they do not provide first  backup option  there is a module called Evotiva Backupscript. It does the backup for your database and files of dnn installation. You can purchase this module from Snowcovered and try to backup* restore your db and portal files into local drive first.

If you are not familiar with these, i can help you to do that (drop an email to support@mynetnuke.com to request quote). But you know, some modules may cause difficulties while back up db. So i can't promise it will be easy task.

Regards.

Hi again, looks like your website is hosted by PowerDNN,

http://www.who.is/whois-com/ip-address/dnnmax.com/

I  have some suggestions for you; please write down here your email address. It is about security.