XLS meaning in File Type ?

Answer: What is Microsoft Works Spreadsheet mean?

Microsoft Works was a productivity software suite developed by Microsoft and sold from 1987 to 2009. Its core functionality included a word processor, a spreadsheet and a database management system. Later versions had a calendar application and a dictionary while older releases included a terminal emulator. Works was available as a standalone program, and as part of a namesake home productivity suite. Because of its low cost ($40 retail, or as low as $2 OEM), companies frequently pre-installed Works on their low-cost machines. Works was smaller, less expensive, and had fewer features than Microsoft Office and other major office suites available at the time.

reference

Full Form	Category
St Louis	Airport Code
Xtra Long Stroke	Business
Exelis Inc.	Business
Xenon Light Source	Chemistry
Microsoft Excel Spreadsheet	Computing
Xml for Location Services	Computing
Extended Light Scatterer	Electronics
Excimer Laser System	Electronics
Microsoft Works Spreadsheet	File Type
Extra Luxe Super	General
Executive Luxury Sport	General
Exchangeable Led Signal	General
St. Louis, Senegal	Regional
Saint-Louis Airport	Transport & Travel