SQL Expres won't open sample files in lessons

I don't get it. MS supplies a turorial lesson, and I can't open the .mdb files, get version exception. Any thoughts? I installed the entire package after deleting all SQL, etc.

Thanks,

Jon

[201 byte] By [Jon-Whew!] at [2008-2-15]
# 1
SQL Server will not open *.mdb files as they are Access Database files, the files for SQLExpress have an extension of *.mdf for the data files, and *.ldf for the database transaction log files.
GlennWilson at 2007-9-8 > top of Msdn Tech,Visual Studio Express Editions,Visual C# 2005 Express Edition...