Unable to create Excel file in vb.net using Open XML / OpenDocument SDK

I'm struggling with a  vb.Net project to create a simple Excel file using Open XML.  I have installed Open XML 2.5 and have added WindowsBase 4.0.0.0 and DocumentFormat.OpenXml 2.5.5631.0 to the project and the code below compiles fine.

The problem is the resulting file is corrupt.  I would upload it but Experts Exchange is reporting an error when I try.

Is anything obviously wrong with the code below?  I have found posts referencing a OpenDocument Tool I should be able to use to view the file but I don't seem to have it on my system and cannot find where to download it.

        Dim excelStream As New MemoryStream()

        Using spreadSheet = SpreadsheetDocument.Create(excelStream, SpreadsheetDocumentType.Workbook)
            'Create workbook
            spreadSheet.AddWorkbookPart()
            spreadSheet.WorkbookPart.Workbook = New Workbook()

            'Create worksheet
            spreadSheet.WorkbookPart.AddNewPart(Of WorksheetPart)()
            spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet = New Worksheet()

            'Create worksheet
            spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet.AppendChild(New SheetData())

            'Create Header Row
            Dim row = spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet.First().AppendChild(New Row())
            row.Append(New Cell With {.DataType = CellValues.String, .CellValue = New CellValue("TestHeader")})

            'Save worksheet
            spreadSheet.WorkbookPart.WorksheetParts.First().Worksheet.Save()

            'Create the worksheet to workbook relation
            spreadSheet.WorkbookPart.Workbook.AppendChild(New Sheets())
            spreadSheet.WorkbookPart.Workbook.GetFirstChild(Of Sheets).AppendChild(
                New Sheet() With
                {
                    .Id = spreadSheet.WorkbookPart.GetIdOfPart(spreadSheet.WorkbookPart.WorksheetParts.First()),
                    .SheetId = 1,
                    .Name = "StockNbr"
                }
            )

            'Save and reset stream position
            spreadSheet.WorkbookPart.Workbook.Save()
        End Using

        excelStream.Position = 0
        Dim fileOut As New FileStream("C:\test.xlsx", FileMode.OpenOrCreate, FileAccess.ReadWrite)
        excelStream.CopyTo(fileOut)
        fileOut.Flush()
        fileOut.Close()

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canuckconsultingAsked:
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Bob LearnedCommented:
When you try to open the file with Excel, is there an option to view the log?  In the past, I have seen a log that tries to show the issues with opening the file.
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canuckconsultingAuthor Commented:
No, I don't get any option.  I'm just advised that the file is corrupt.
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Bob LearnedCommented:
I am thinking that it you shouldn't write to an .xlsx file since that is a specialize compressed package file structure, and Excel would expect that structure.
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canuckconsultingAuthor Commented:
It ended up being something local on my machine as compiling the same code and running it on another box worked fine.  I'm marking this as the answer to close the question though in my case it wasn't the issue.
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