Throw OpenXmlPackageException A shared part is referenced by multiple source parts with a different relationship type

Describe the bug The OpenXML SDK will throw OpenXmlPackageException when open the special pptx file.

DocumentFormat.OpenXml.Packaging.OpenXmlPackageException: 'A shared part is referenced by multiple source parts with a different relationship type.'

And this pptx file can open well with Office PowerPoint.

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Why the OpenXML SDK throw OpenXmlPackageException ?

Because the Relationship define the same part with a different relationship type. Such the test file in my repo, and the content in slide1.xml.rels is:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
  <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout" Target="../slideLayouts/slideLayout1.xml" />
  <Relationship Id="rId5" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/video" Target="NULL" TargetMode="External" />
  <Relationship Id="rId21" Type="http://schemas.microsoft.com/office/2006/relationships/recovered" Target="../media/media1.mp3" />
  <Relationship Id="rId19" Type="http://schemas.microsoft.com/office/2007/relationships/media" Target="../media/media1.mp3" />
  <Relationship Id="rId20" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" Target="../media/image1.png" />
</Relationships>

And you can find the Type of media1.mp3 is http://schemas.microsoft.com/office/2006/relationships/recovered and http://schemas.microsoft.com/office/2007/relationships/media

Screenshots

To Reproduce

My test code: https://github.com/lindexi/lindexi_gd/tree/d50ffc8321cbe33c50752557684581f1b1dc78f8/WhulaylurnurCearkolaifonerebairkur

1. Download my code from: https://github.com/lindexi/lindexi_gd/tree/d50ffc8321cbe33c50752557684581f1b1dc78f8/WhulaylurnurCearkolaifonerebairkur
2. Run the code
3. See error

Observed behavior

Throw the OpenXmlPackageException.

DocumentFormat.OpenXml.Packaging.OpenXmlPackageException: 'A shared part is referenced by multiple source parts with a different relationship type.'

Call stack:

 	[Exception] DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer.LoadReferencedPartsAndRelationships(DocumentFormat.OpenXml.Packaging.OpenXmlPackage openXmlPackage, DocumentFormat.OpenXml.Packaging.OpenXmlPart sourcePart, DocumentFormat.OpenXml.Packaging.RelationshipCollection relationshipCollection, System.Collections.Generic.Dictionary<System.Uri, DocumentFormat.OpenXml.Packaging.OpenXmlPart> loadedParts)	Unknown
 	[Exception] DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer.LoadReferencedPartsAndRelationships(DocumentFormat.OpenXml.Packaging.OpenXmlPackage openXmlPackage, DocumentFormat.OpenXml.Packaging.OpenXmlPart sourcePart, DocumentFormat.OpenXml.Packaging.RelationshipCollection relationshipCollection, System.Collections.Generic.Dictionary<System.Uri, DocumentFormat.OpenXml.Packaging.OpenXmlPart> loadedParts)	Unknown
 	[Exception] DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer.LoadReferencedPartsAndRelationships(DocumentFormat.OpenXml.Packaging.OpenXmlPackage openXmlPackage, DocumentFormat.OpenXml.Packaging.OpenXmlPart sourcePart, DocumentFormat.OpenXml.Packaging.RelationshipCollection relationshipCollection, System.Collections.Generic.Dictionary<System.Uri, DocumentFormat.OpenXml.Packaging.OpenXmlPart> loadedParts)	Unknown
 	[Exception] DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.OpenXmlPackage.Load(System.IO.Packaging.Package package)	Unknown
 	[Exception] DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.PresentationDocument.Open(string path, bool isEditable, DocumentFormat.OpenXml.Packaging.OpenSettings openSettings)	Unknown
>	[Exception] WhulaylurnurCearkolaifonerebairkur.dll!Program.<Main>$(string[] args) Line 3	C#
 	DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.OpenXmlPackage.Load(System.IO.Packaging.Package package)	Unknown
 	DocumentFormat.OpenXml.dll!DocumentFormat.OpenXml.Packaging.PresentationDocument.Open(string path, bool isEditable, DocumentFormat.OpenXml.Packaging.OpenSettings openSettings)	Unknown
 	WhulaylurnurCearkolaifonerebairkur.dll!Program.<Main>$(string[] args) Line 3	C#

Expected behavior The OpenXML SDK can open the document. And I think we should handle the http://schemas.microsoft.com/office/2006/relationships/recovered type.

Desktop (please complete the following information):

• OS: Windows 10 21H2 19044
• Office version None.
• .NET Target: dotnet 6.0.9
• DocumentFormat.OpenXml Version: 2.18.0

[tomjebo]

@lindexi thanks for confirming and bringing this to our attention.

[tomjebo]

@lindexi I’ve added PR #1207 that should fix the loading issue. Please feel free to clone my branch and test if you’d like.