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You can change the Version number of an Excel file by right‑clicking the file, selecting Properties > Details, and then editing the Version number field. Please use the BuiltInDocumentPropertyCollection.SetDocumentVersion() method to change it programmatically using the Aspose.Cells APIs.
The following sample code creates a workbook and changes its built‑in document properties that include Title, Author, and Version number. Please see the output Excel file generated by the code and the screenshot that shows the modified Version number by the BuiltInDocumentPropertyCollection.SetDocumentVersion() property.

#include <iostream>
#include "Aspose.Cells.h"
using namespace Aspose::Cells;
using namespace Aspose::Cells::Properties;
int main()
{
Aspose::Cells::Startup();
// Create workbook object
Workbook wb;
// Access built‑in document property collection
BuiltInDocumentPropertyCollection bdpc = wb.GetBuiltInDocumentProperties();
// Set the title
bdpc.SetTitle(u"Aspose File Format APIs");
// Set the author
bdpc.SetAuthor(u"Aspose APIs Developers");
// Set the document version
bdpc.SetDocumentVersion(u"Aspose.Cells Version - 18.3");
// Save the workbook in xlsx format
wb.Save(u"outputSpecifyDocumentVersionOfExcelFile.xlsx", SaveFormat::Xlsx);
std::cout << "Document properties set and file saved successfully!" << std::endl;
Aspose::Cells::Cleanup();
}
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