While searching through here, I've seen some discussion of this error, but I think I'm complying with all the advice I've seen so far...
I am moving a database from one SQL Server to another. Both are 2000.
I detached the database from the origin Server using the detach functionality in Enterprise Manager. Next, I copied the .mdf and .ldf to the new computer. Then I used the attach functionality in Enterprise Manager on the new Server to try to attach the database.
I get Error 5172 about the file size property, and the database does not attach.