Copy the file to your computer. Change the snb extension to zip (an snb file is actually a zip file). Then Windows can open it and you can save whatever isn't corrupted.
As far as the corrupted part - there used to be programs that could recover corrupted zip files - from back when Phil Katz was still writing zip and its affiliates. If you can find one - it'll run in a cmd window, no pretty user interfaces back then - run it on the entire corrupted zip file and it may be able to create an uncorrupted copy. (It depends on what's corrupted. A corrupted directory is probably about the easiest to fix. A corrupted picture file is probably impossible.)
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