Microsoft Office XP primary interop assemblies (PIAs) are available for download

This article was previously published under Q328912
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Microsoft supplies several primary interop assemblies (PIAs) that contain the official description of the most commonly used Microsoft Office XP type libraries. These Microsoft Office XP PIAs make interoperability easier between managed code and Office XP COM type libraries.
Component Object Model (COM) interop assemblies allow unmanaged (COM) code to be called from managed (.NET) code by using the Microsoft .NET Framework and the common language runtime. COM interop assemblies allow managed applications to bind to unmanaged types at compile time, and then provide information to the common language runtime about how the unmanaged types must be marshaled at run time.

While any number of COM interop assemblies may exist for a particular type library, only one COM interop assembly is designated as the PIA. The PIA contains the official description of the unmanaged types that are defined by the publisher of those unmanaged types. Additionally, a PIA is always digitally signed by that publisher.

Generally, you must avoid the use of any Office XP COM interop assembly that is not provided as part of the Office XP PIAs. You must also avoid the use of any Office XP COM interop assembly that is generated by Microsoft Visual Studio .NET at design time. Any Office XP interop assembly that is not included in the Office XP PIAs download is considered unofficial.

To download the official PIAs available to Microsoft Office XP applications and associated technologies, visit the following Microsoft Download Center Web site: The following list represents the assemblies that are included in this Office XP PIA download:
  • adodb.dll
  • dao.dll
  • Microsoft.Office.Interop.Access.dll
  • Microsoft.Office.Interop.Excel.dll
  • Microsoft.Office.Interop.FrontPage.dll
  • Microsoft.Office.Interop.FrontPageEditor.dll
  • Microsoft.Office.Interop.Graph.dll
  • Microsoft.Office.Interop.Outlook.dll
  • Microsoft.Office.Interop.OutlookViewCtl.dll
  • Microsoft.Office.Interop.Owc.dll
  • Microsoft.Office.Interop.PowerPoint.dll
  • Microsoft.Office.Interop.Publisher.dll
  • Microsoft.Office.Interop.SmartTag.dll
  • Microsoft.Office.Interop.Visio.dll
  • Microsoft.Office.Interop.Word.dll
  • Microsoft.Vbe.Interop.dll
  • mscomctl.dll
  • msdatasrc.dll
  • office.dll
  • stdole.dll
For additional information about building Office solutions by using Visual Studio .NET, click the following article number to view the article in the Microsoft Knowledge Base:
311452 Develop Microsoft Office solutions with Visual Studio .NET
excel word powerpoint access outlook frontpage

Article ID: 328912 - Last Review: 12/07/2015 12:35:10 - Revision: 8.5

Microsoft Access 2002 Standard Edition, Microsoft Excel 2002 Standard Edition, Microsoft Outlook 2002 Standard Edition, Microsoft FrontPage 2002 Standard Edition, Microsoft PowerPoint 2002 Standard Edition, Microsoft Word 2002, Microsoft Publisher 2002 Standard Edition, Microsoft Visio 2002 Professional Edition

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