Charts directory appears under the drawings directory when packaged

[Tsarass]

Description
We are creating spreadsheets using OpenXML with charts. The resulting xlsx files contain the 'charts' directory as a subdirectory of the 'drawings' directory instead of being at the same level as 'drawings' and 'worksheets' directories (under 'xl'). We could not find a workaround in the API to get the expected result.

The xlsx files output by other applications (Excel, LibreOffice Calc etc) output the 'charts' as a sibling directory of 'drawings' instead.

Note: the file can be opened normally in Excel applications as it is.

Here is a tree view of the packaged structure of the xlsx files we are getting with the minimum repro:

Here is the expected output:

To Reproduce

SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create("charts-test.xlsx", SpreadsheetDocumentType.Workbook);
WorkbookPart workbookPart = spreadsheetDocument.AddWorkbookPart();
workbookPart.Workbook = new Workbook();
WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
worksheetPart.Worksheet = new Worksheet(new SheetData());

Sheets sheets = workbookPart.Workbook.AppendChild(new Sheets());
Sheet sheet = new Sheet() { Id = workbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "mySheet" };
sheets.Append(sheet);

DrawingsPart drawingsPart = worksheetPart.AddNewPart<DrawingsPart>();
drawingsPart.AddNewPart<ChartPart>();

workbookPart.Workbook.Save();
spreadsheetDocument.Dispose();

Desktop:

• OS: Windows 11
• Office version 16.0.17231.29236
• .NET Target: NET Framework 4.7.2
• DocumentFormat.OpenXml Version: 3.0.0

[mikeebowen]

Hi @Tsarass,

As long as the paths are correct in the rels the file is valid and Excel will open it without issue. Does the file you create not open and/or cause errors when you try to open it in Excel?

[Tsarass]

Hi @Tsarass,

As long as the paths are correct in the rels the file is valid and Excel will open it without issue. Does the file you create not open and/or cause errors when you try to open it in Excel?

The file can be opened normally indeed, its just the file structure that's off. I should probably clarify that in the OP as well.

I happen to have a tool that depends on the file structure being right and was wondering why that would happen, it would seem relatively easy to fix (if there is no workaround already).