GTK+/pango 32-bit on Windows 64-bit

[kcirtap lavabit com]

Is anyone aware of any issues running GTK+ and/or pango 32-bit on Windows
7 64-bit?

Unfortunately I don't have 64-bit hardware at my disposal to test this on,
but someone who's trying to use my app is reporting that when they run it,
they get:

"libpango-1.0-0.dll is either not designed to run on Windows or it
contains an error."

I'm using the gtk+-bundle_2.16.6-20091013_win32.zip bundle, by the way.