DON'T DELETE THIS REPOSITORY. This application was removed from the original location. This is the only repository in github which holds this application!
original location: http://openxmldeveloper.org/blog/b/openxmldeveloper/archive/2006/05/31/261.aspx
Simple OOXML Package Explorer allows to browse content of xlsx, docx and pptx-files, which are created by Microsoft Office since version 2007.
original location: http://openxmldeveloper.org/blog/b/openxmldeveloper/archive/2006/05/31/261.aspx
more on Office Open XML format: https://de.wikipedia.org/wiki/Office_Open_XML
The solution was compiled with MS Visual Studio 2015 and Windows 7.