EXEC sp_attach_db have a error

I entered the following in the Query Analyzer and got the result shown:

EXEC sp_attach_db @.dbname = N'DS2004',
@.filename1 = N'd:\ds2004_data.mdf',
@.filename2 = N'd:\ds2004_log.Ldf'

Server: Msg 5172, Level 16, State 15, Line 1
The header for file 'd:\ds2004_data.MDF' is not a valid database file header. The PageAudit property is incorrect

I can find nothing about PageAudit property.

What is it and how do I need to modify the command?

Many thanksI believe the message is trying to tell you that the PageAudit property of the database file header property in ds2004_data.mdf is bad. I think your command is okay, but you have a corrupted file.|||Maybe you're trying to detach a SQL 2k db and restore to SQL 7.0? It doesn't work. Attach or restore a sql 2000 database to version 7.0 is not supported.