Created attachment 108922 [details]
Original file

I used XML validator on sample document from the net (http://www.columbia.edu/~dj114/excel-examples.xls) after having some issues with parsing XML contents of the file.
XML Parser finds redefined attribute and stops on it.

I converted the document by saving it in XLSX format, then I also tried to convert it using this command to check if there would be some difference:
"soffice.exe --headless --convert-to xlsx:"Calc MS Excel 2007 XML" --outdir output_dir in.doc"
I had the same result regardless of the way I convert this file.

This problem could be simply reproduced by checking the contents of XLSX file in "/xl/drawings".
Libre Office defines type attribute for "v:shape" two times.

I checked this problem on Win 7 64 and Gentoo.