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The JPG file is a great format as it often manages to compress files to 1/10 of the size of the original file which is especially good for saving on bandwidth. The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered. JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved. Microsoft Office binary file format specifications.

How to open an XLS file without Microsoft Excel.Most versions of Microsoft Excel can read CSV, DBF, SYLK, DIF, and other legacy formats. Used as the basis for XLS files it is a persistence format that supports authoring and manipulating content in workbooks and workbook templates. Microsoft Excel up until 2007 version used a proprietary binary file format called Binary Interchange File Format (BIFF) as its primary format. The current versions are 2010 for Microsoft Windows and 2011 for Mac OS X.

It has been a very widely applied spreadsheet for these platforms, especially since version 5 in 1993, and it has almost completely replaced Lotus 1-2-3 as the industry standard for spreadsheets. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications. Pre-2007 versions of Excel use XLS as the primary format for saving files. Microsoft Excel is a commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X.