Issue with openxml documents

I use openxml and convert my dotx files to docx files with some contents in .Net. After conversion when i send the docx document through mail, iPad mail app shows the following error while opening the document. And in iPhone the contents are misplaced. Can someone pls provide me a better solution asap?? I tried opening the document using third party apps too but nothing worked out.

And the docx file that i tried opening is as follows