Use this alternate zip process to uncorrupt your file. (Idea based on answer at https://askubuntu.com/questions/54904/unzip-error-end-of-central-directory-signature-not-found)
mkdir DOCX cd DOCX jar xvf ../Commission\ Plan.docx jar cvf ../Commission\ Plan2.docx *
This will decompress and recompress using the superior zip utility build into the java runtime on your system.