drush wfx --format=excel cannot create fite

The drush wfx command works fine with delimited files, but fail when creating the new-style Excel xlsx files. These files are actually zip archives containing a variety of XML files. The xlsx exporter creates the stylesheet XML file, incorporates it with other files into a Zip, unlinks the original and attempts to rename the zip as the new files. At this point, When run via drush, the temporary file stream isn't the file system and the rename fails.