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Editorial Team
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Asked: 2026-06-01T10:57:08+00:00

The Current Setup: So, I can use the following code to save a file

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The Current Setup:

So, I can use the following code to save a file as an XLS:

_myWorkbook.SaveAs("FileName.xls", Excel.XlFileFormat.xlWorkbookNormal)

I can also use the following code to save a file as an XLSX (Since I use Office 2010):

_myWorkbook.SaveAs("FileName.xlsx", Excel.XlFileFormat.xlWorkbookDefault)

The Issue:

I have tried (unsuccessfully) to save the file as an XLSX using the following code:

_myWorkbook.SaveAs("FileName.xlsx", Excel.XlFileFormat.xlExcel12)

Why does this not work? Last I checked, Excel 12 was Excel 2007 (a version that supports XLSX). Am I missing something?

(For those interested, I get a This extension can not be used with the selected file type error)

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1 Answer

  1. Editorial Team

    Actually XlFileFormat.xlExcel12 is Excel 12.0 binary format (xlsb) , for OpenXML (i.e. xlsx) you need to use XlFileFormat.xlOpenXMLWorkbook enum value.

    For a complete reference see here.

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