Updating my own journal

, I have learned a some new information about using gamesaves.
First off, Gameshark has a very limited achive of savesfiles (at least in terms of roster updates). There are outside sources that work through the Gameshark software to create updated rosters.
A website titled
http://www.ps2rosters.com keeps on top of popular sports game updates for both P2S and XBox. They have all of the minor league baseball rosters filled out as well as the major league rosters.
And according to their help guide, you simply download their winzip file then drag it (unzipped) into the "memory card" section of your Gamesaves software.
My new problem is when I drag the unzipped file into my "momory card" section nothing happends. So I drag it into my "game saves" file and it says invalid file.
I must be taking a roundabout route toward getting updated rosters for MVP 2004 Baseball. This is frustrating!
Any help would be appriciated.