Conversion of xla files to xlsx file format

Everything points to the fact that you cannot convert .xla files to .xlsx on any other Excel for add-in for that matter. XLA format is used for add-ons, plugins used to enhance the functionality of Microsoft Excel. The only thing you could potentially do is to import the .xla file to Excel and based on the imported functionalities produce or edit .xlsx spreadsheet.

Open XLA file    Open XLSX file

Related software

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Microsoft Excel

A popular spreadsheet application distributed with Microsoft Office suite

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Microsoft Excel for Mac

A popular spreadsheet application from the Microsoft Office suite