The file contains output of gnumeric 1.12.6 from Debian testing ("Jessie"). The file testfile-xlsx-12.xlsx is a test file for bug 67436. 

$ LANG=C gnumeric testfile-xlsx-12.xlsx 
Unexpected element 'fileSharing' in state : 
	workbook
Encountered uninterpretable "ext" extension in namespace "smNativeData"
Unexpected element 'pm:revision' in state : 
	workbook -> extLst -> ext
Unexpected element 'a:extLst' in state : 
	wsDr -> twoCellAnchor -> graphicFrame -> nvGraphicFramePr -> cNvGraphicFramePr
Unexpected element 'c:view3D' in state : 
	chartSpace -> chart
Unexpected element 'c:wMode' in state : 
	chartSpace -> chart -> plotArea -> layout -> manualLayout
Unexpected element 'c:hMode' in state : 
	chartSpace -> chart -> plotArea -> layout -> manualLayout
Unexpected element 'c:numFmt' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showPercent' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showBubbleSize' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:numFmt' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showPercent' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showBubbleSize' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:numFmt' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showPercent' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showBubbleSize' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:numFmt' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showPercent' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showBubbleSize' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:numFmt' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showPercent' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showBubbleSize' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls -> dLbl
Unexpected element 'c:showLegendKey' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls
Unexpected element 'c:showSerName' in state : 
	chartSpace -> chart -> plotArea -> pieChart -> ser -> dLbls
Unexpected element 'c:dLbls' in state : 
	chartSpace -> chart -> plotArea -> pieChart
Unexpected element 'c:wMode' in state : 
	chartSpace -> chart -> legend -> layout -> manualLayout
Unexpected element 'c:hMode' in state : 
	chartSpace -> chart -> legend -> layout -> manualLayout
Unexpected element 'c:extLst' in state : 
	chartSpace
Unexpected element 'a:extLst' in state : 
	wsDr -> twoCellAnchor -> sp -> nvSpPr -> cNvSpPr

** (gnumeric:2363): CRITICAL **: xlsx_chart_grad_stop: assertion `state->cur_style' failed

** (gnumeric:2363): CRITICAL **: xlsx_chart_grad_stop: assertion `state->cur_style' failed
Unexpected element 'a:path' in state : 
	wsDr -> twoCellAnchor -> sp -> spPr -> gradFill
Unexpected element 'a:tileRect' in state : 
	wsDr -> twoCellAnchor -> sp -> spPr -> gradFill
Unexpected element 'a:effectLst' in state : 
	wsDr -> twoCellAnchor -> sp -> spPr
Unexpected element 'a:scene3d' in state : 
	wsDr -> twoCellAnchor -> sp -> spPr
Unexpected element 'a:sp3d' in state : 
	wsDr -> twoCellAnchor -> sp -> spPr
stuff!J60 : Dropping missing object

** (gnumeric:2363): CRITICAL **: go_font_free: assertion `font->ref_count == 1' failed