Hi...thks for your quick response

I tried to restore the database directly in sql 2005 but I got this error.

Msg 3241, Level 16, State 0, Line 1

The media family on device 'D:\Database.dat' is incorrectly formed. SQL Server cannot process this media family.

Msg 3013, Level 16, State 1, Line 1

RESTORE FILELIST is terminating abnormally.

The 6.5 Backup it's fine, because I restored the same backup on the 6.5 server and there is no problem.