Diablo 2, v 1.9 patch, what's an .ace file?

[Frazzled]

I've been attempting to get ahold of the crack for the Diablo 2 v 1.9 and the file that I get is an .ace file. I've tryed using standard unzip and unrar utilities on it thinking that maybe someone just renamed the file or something like that, but I had no luck. Could someone point me to where I can get something that will uncompress the .ace file?

Thanks