https://www.tntware.com/tntconnect/help/faq_en/pages/how-do-i-get-past-quot-unrecognized-database-format-39-mpddb-39-quot.aspxThe Quick Fix This error means that your database file has been corrupted. The solution is to restore a backup. Under the " File " menu, click on " Restore " to see a list of recent auto-backups. Select the most recent backup and click the " Restore enCommunityServer 2008.5 SP2 (Debug Build: 40407.4157)