gvim64/win7 claims error on unzip, but unzip get no error, why?

I tried to open a .jar file in gvim (7.3). and got an error (which one
has to type in manually, as vim won't let you cut/paste -- a much
maligned user-hindrance, when it was first widely used by Microsoft):

unzip: cannot find or open C:/Users/lindaw/AppData/Roaming/....

So I open up a console window and try the command:
(and)...
***warning*** (zip#Browse) ... same message as above....

/Users/lindaw> unzip -l
C:/users/lindaw/AppData/Roaming/Mozilla/Firefox/Profiles/lindaw/extensions/{funnynumber}/chrome/file.jar
Archive:
C:/users/lindaw/AppData/Roaming/Mozilla/Firefox/Profiles/lindaw/extensions/{funnynumber}/chrome/file.jar
Length Date Time Name
--------- ---------- ----- ----
1109 09-29-2011 07:39 content/menucommander.js
14574 09-29-2011 07:39 content/browser.js
22524 09-29-2011 07:39 content/script.js
3416 09-29-2011 07:39 content/install.js
....

---
I.e. works just fine...

So why didn't it work in Vim? Doesn't make sense.

My first guess is it is I mistakenly installed broken 32-bit version and
it couldn't call the right programs or access the right files due to
windows redirection, but I can't think of any of the programs in this
case, that it would have called where it needed a 64-bit version, so I'm
stumped...

Why does it work at the shell, but not from Vim?

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