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You can change the Language of Excel file by right-clicking the file and then selecting Properties > Details and then editing the Language field. Please use BuiltInDocumentPropertyCollection.Language property to change it programmatically using Aspose.Cells APIs.
The following sample code creates a workbook and changes its built-in document property named Language. Please see the output Excel file generated by the code and screenshot that shows the modified Language field by BuiltInDocumentPropertyCollection.Language property.

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