This issue has been confirmed on Mac OS X 10.5.2 and 10.4.11, it may exist on other versions of Mac OS X as well. Despite how the archive is made (via Mac OS X's builtin facilities or through Stuffit) the archive fails to extract via Mac OS X's builtin facilities once downloaded from sourceforge, the archive does not have this issue before being uploaded to sourceforge.
Workaround #1: Extract using Stuffit DropStuff
Workaround #2: Extract using the following command in Terminal (HD>Applications>Utilities): "unzip desktop/Moire4.0.1.binary.zip". Executing that command will result in the archive's contents being extracted to the directory you are currently in (this will be your home folder unless you cd elsewhere before executing the unzip command).
What am I doing wrong? I am at a loss as to why this issue occurs.