Roo implements read access for all common spreadsheet types. It can handle: * Excel 2007 - 2013 formats (xlsx, xlsm) * LibreOffice / OpenOffice.org formats (ods) * CSV * Excel 97, Excel 2002 XML, and Excel 2003 XML formats when using the roo-xls gem (xls, xml) * Google spreadsheets with read/write access when using roo-google