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Encrypt.inc

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<?php
$ENCRYPTION_NONE = 0;
$ENCRYPTION_WEAK_XOR = 1;
$ENCRYPTION_OFFICE_97_2000_COMPATIBLE = 2;
?>

EasyXLS Excel components:

.NET
Excel Library for PHP
full COM+ version to import, export or convert Excel files
Excel Writer for PHP
COM+ version to create and export Excel files
Download EasyXLS™ Excel Component for PHP

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2019
MS Excel 2021
Office 365
XLSXXLSMXLSBXLS
XMLHTMLCSVTXT