Here's an off-the-top-o-me-head idea...
create a temporary directory (create it somewhere other than Runtime, but name it Runtime)
highlight all the files,
unzip....(I think)
Then copy the 'runtime'' folder to your real Runtime, then drop.

NOTE - this presumes that all your original zip files were created in such a way that they automatically install where they should really go...;)

or if you're really a fossil like me - pkunzip *.zip (although this doesn't always work)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)