problem with revZipOpenArchive in a Mac app bundle?

[Curt Ford]

I'm working on updating a client's project for 64bit compatibility on 
the Mac side.

The project is a menu app that downloads and unzips a number of modules 
from a server. The previous version, done in LiveCode 7, saved & 
unzipped the modules in the app bundle, at 
/Contents/Resources/_MacOS/Modules (that last item is a folder created 
by the app).

This wasn't working when I opened it in LiveCode 9, so I tweaked the 
code to use

specialFolderPath("resources") & slash & "Modules/"

The folder is created and downloaded zip files are saved there as 
expected, but there seems to be a problem extracting it.

I'm trying to follow the steps at 
http://lessons.livecode.com/m/2592/l/126625-zip-tool . It gets as far as 
starting the listZipContents handler, then gives a blank window 
"Execution Error" with a close button. Immediately after 
revZipOpenArchive I have "answer the result" which never shows, so it 
seems to be a problem with revZipOpenArchive?

I'm just feeling my way here... any thoughts on what's going wrong? In 
case it matters: each zipped file is a folder that contains a LiveCode 
stack and a subfolder "media" containing some mp3 files.

My clumsy debugging code:
-- lists the content of an archive pArchive
on listZipContents pArchive
    if the controlKey is down then
       answer "starting listZipContents, pArchive is" && pArchive
    end if
    --IT SEEMS TO FAIL HERE
    revZipOpenArchive pArchive, "read"
    if the controlKey is down then
       answer the result
    end if
    if the controlKey is down then
       answer "just did revZipOpenArchive"
    end if
   local tZipContents
   put revZipEnumerateItems(pArchive) into tZipContents
   put tZipContents into field "FileList"
   if the controlKey is down then
      answer "about to do revZipCloseArchive"
   end if
   revZipCloseArchive pArchive
   if the controlKey is down then
      answer "just did revZipCloseArchive"
   end if
end listZipContents

-Curt
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