File extension xls information

A user without Excel can still open excel files by downloading Microsoft’s free excel viewer. File extension XLS is applied in Microsoft Excel spreadsheet applications. Microsoft Excel is very similar to many other spreadsheet applications that store information to be viewed and edited on several platforms. The programs that open Microsoft Excel and XLS files on the Mac and windows OSs installed with MSOffice application. Microsoft Excel files contain information similar to that provided by databases as well as formulas, graphs, charts and images that are necessary in presentation of reports.
Microsoft Excel files stores data in columns and rows that have a unique identification, for example A1 cell number is under row 1 and column 1. Microsoft Excel viewer 2003 can only open File extension XLS files created with the earlier versions o Excel by installing a compatibility pack to replace previous versions. The earlier versions of Microsoft Excel applications allowed users to attach macros to a file and this made it vulnerable to viruses. The option was terminated in Microsoft Excel 2003 version that changed the file association to XMLSS.