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NPOI Open Xlsx document modified on Apple system

Aug 24, 2016 at 11:14 AM
Hi everyone,

i've a problem when i try to open a workbook with XSSFWorkbook method.
With a lot of xlsx file i've got no problem, but if we made some changes on a excel file with a Mac Pro and try to open it in my project i got this error stacktrace :
Wrong Local header signature: 0x4ACF92AD
   à ICSharpCode.SharpZipLib.Zip.ZipInputStream.GetNextEntry()
   à NPOI.OpenXml4Net.Util.ZipInputStreamZipEntrySource..ctor(ZipInputStream inp)
   à NPOI.OpenXml4Net.OPC.ZipPackage..ctor(Stream filestream, PackageAccess access)
   à NPOI.OpenXml4Net.OPC.OPCPackage.Open(Stream in1)
   à NPOI.Util.PackageHelper.Open(Stream is1)
   à NPOI.XSSF.UserModel.XSSFWorkbook..ctor(Stream is1)
You can found code i wrote below :
        protected static IWorkbook GetWorkbook(FileInfo file)
            IWorkbook workBook = null;

            using (var stream = file.OpenRead())
                stream.Position = 0; // <-------- rewind the stream
                if (file.Name.ToUpper().EndsWith(".XLSX"))
                    workBook = new XSSFWorkbook(stream);
                else if (file.Name.ToUpper().EndsWith(".XLS"))
                    workBook = new HSSFWorkbook(stream);

            return workBook;
I think i've a problem when we save it on Appel and try to read it on Microsoft system.

How can i do to solve it and allow my project to open Excel file by any possible mean ?

Thanks a lot