mp3gtoolz will batch unzip. I do not know if this is still the case but in the past Hoster had a problem with any file zipped with toolz. That may no longer be the case and/or it may not be the case with newer versions of toolz. If you can use toolz you'll have to make sure all your zips are in the same folder to batch unzip/zip.
It's a free download but I don't recall the website, you'll have to do a yahoo search for it. It also requires a file be downloaded and installed from microsoft that you may or may not already have. You'll find a link for that at the website.
It's been my experience that often times winzip had problems unzipping files zipped with toolz and vice versa, so toolz may or may not work for you in unzipping, so this advice may be all for naught.
Now if you can at least come up with a way to unzip you can always just import as mp3g into Hoster and forget rezipping. Mp3g's import in the same manner as zipps.
Sam
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