For others with the same problem, SAP AGS suggested using WinRAR to extract this particular archive, and that worked. If you don't have this installed, you can download a temporary free trial version to get the job done. It might also be extractable with other third-party tools, such as 7zip, but I can't confirm that.
This isn't the case with the other MDM sp13 ZIP files -- they all extract just fine with the Windows "built-in" extractor.
Thanks, Kristen, for following up on this!