XLSX Excel Spreadsheets are different than the XLS version in that they use the Microsoft Office Open XML format. The Open XML format makes it easy for other programs, such as OpenOffice.org, to read XLSX files (and other Open XML file types). The Open XML format was introduced with Microsoft Office 2007.
It was first published anonymously in Paris in 1697 in Histoires ou contes du temps passe (PassÃ©: English stories Or tales Of Past), times a collection of eight fairy tales By. perrault
Its motif circulated even in Ancient Greece. It was first written down (as, initially, stories circulate orally) during the 17th century, when â¦ it was made famous by French writer Charles Perrault and only later by the Brothers Grimm (during the 19th century).