Convert XLSM to XLSX

Question

I\'m using the EPPLUS library to read data from Excel to create another file. Unfortunately it does not support the .XLSM extension file. Is there a nice way to convert .X

Answer 1

Using the Open XML SDK, like in amurra's answer, but in addition to changing doc type, VbaDataPart and VbaProjectPart should be removed, otherwise Excel will show error a file is corrupted.

using (var inputStream = File.OpenRead("C:\\temp\\test.xlsm"))
using (var outStream = new MemoryStream()) {
    inputStream.CopyTo(outStream);
    using (var doc = SpreadsheetDocument.Open(outStream, true)) {
        doc.DeletePartsRecursivelyOfType();
        doc.DeletePartsRecursivelyOfType();
        doc.ChangeDocumentType(DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook);
    }
    File.WriteAllBytes("C:\\temp\\test.xlsx", outStream.ToArray());
}