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XLSX is a file format created with Microsoft Excel, version from 2007 and younger. This file is a spreadsheet. All data distributed document and stored in the cells. Each cell has a unique address, which is denoted by the letters and Arabic numerals. XLSX file format is based on the Open XML. To reduce the size of the file is compressed ZIP.

Is an e-book format developed for the Psion Series 3 platform used in the 1990s. It contains text and its formatting parameters. This e-book format was used exclusively in Psion devices.