I read that the app can unzip files, but how? I never even saw an "Extract All" button. AND I've had it for a few weeks now! (Seen everything basically.)
But if it's possible, how do I do it? Thanks in advance!

IF you reply... e-e

I've never used the app but what happens when you click on a zip file?

It opens it, but doesn't unzip it...

Can you copy files from it to somewhere else? For example open it and copy files? I don't really know how the app works I'm just guessing.

Get WiiXplorer and try it yourself. It's better than SDExplorer. You can even use an FTP Client...whatever the heck that is...