I have a sql database backup in my system with extension *.bak.
Once I restore the database in sql 2008 it restore the database correctly.the problem arise only when it try to add some more fields to a particular table of the backup database.
Once I add some field and click on save it says
Unable to modify table.
Save changes are not permitted.the changes you have made require the following tables to be dropped and re-created.
The error you get is caused by a flag in SSMS: nothing to do with the restore
Also mentioned on MSDN as “Save (Not Permitted) Dialog Box”