Does the Membership plugin support (protect and mask) ZIP files?

I've got membership setup and it is protecting/masking .TXT, .PDF, etc. files perfectly (using complete protection). I am preparing for a launch this Thursday and am running into an issue with other file types, specifically .ZIP files. When the masked .ZIP file is downloaded and executed or extracted, the following error displays:

“Windows cannot open the folder”. The compressed (zipped) folder ‘filepath’ is invalid.”

I have disabled and then enabled (one by by) all other plugins to see if there is a conflict to no avail. The links being used on the pages are /downloads/2014/08/ The same URL group is protecting other files not in ZIP format.

Please help!