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You can change the language of an Excel file by right‑clicking the file, selecting Properties > Details, and then editing the Language field. Please use the 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 the screenshot that shows the modified Language field, using the BuiltInDocumentPropertyCollection.Language property.

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