The file that
psiho posted is missing the
monster.exe file to help
Itemtype.dat editor v2.exe run.
His download won't work.
[*]Try looking here>>>

<hr>
2.0 Hot Section!<hr>[*]
ItemType:<hr>
You'll find 5 links there that will help you out.
Be aware that the
Itemtype.dat editor v2.exe won't edit the shields or tort gems, you'll have to use
coder62's tool
Itemtype decrypter/encrypter to edit those by hand in a editor.