Unfortunately, we do not know about any useable xsl to xlsx conversion at the moment or what such conversion should represent. Nonetheless it might be something related to MS Excel and even a typo for xls to xlsx conversion, i.e. saving older spreadsheet to modern Excel format.
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Conversion of xsl file format to xlsx file format beta
Search for xsl to xlsx converter or software able to handle these file types.
Convert FileMaker database design report template to Microsoft Excel Open XML workbook and spreadsheet.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: xsl file extension details, xlsx file extension details
XSL
An xsl file extension is related to the FileMaker (Claris) and used for its database design report template files.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
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