https://chromewebstore.google.com/detail/xlscloud-editor-for-xls-x/opdljgpndkbanhjibhjiemnkplbdbpnb
XlsCloud - editor for xls & xlsx - Chrome Web Store
Create or edit spreadsheets that use OpenDocument format (ODF) and Microsoft Excel xls/xlsx formats.
xlscloudeditorxlsxchromeweb