How to open a .zip file which is embedded in .xlsx file? I have a .zip file which has been embedded in a .xlsx file (excel ). But everytime I double click on the file it keeps giving this message:

Cannot start source application for this object. There may not be enough space in memory.

How can I open the .zip file? I have downloaded the unarchiver and also OpenXMLConvertor.But I dont know how to use them to extract the file. 

I have Microsoft Excel 2011 (Version 14.0.0) and MAC OS X mountain lion, 64 bit , macbook air (2013). Kindly help
The thing is - all Microsoft Office documents are ZIP files containing XML files. I would try this:


copy the XLSX to another location
Rename the copy by addin ".zip" to it (ignore the warnings)
unzip the copy with your favourite tool (Unarchiver or terminal "unzip ")
look through the folder structure and find your zip file.