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Microsoft Excel 12.0 Object Library Unanswered you suggestion is not working it shows not registered. When i try to register it prompts with entry point not found. You can select another application's objects that you want available in your code by setting a reference to that application's object library. From the Developer tab, open a Visual Basic project window. See Make the Developer tab visible below if it's not open. On the Tools menu, click References. Microsoft Office 14.0 Object Library (Office shared functionality) Microsoft Office 15.0 Object Library (Office shared functionality) office.dll: Microsoft Office Outlook View Control (can be used in Web pages and applications to access your Inbox) Microsoft.Office.Interop.OutlookViewCtl.dll: Microsoft Outlook 14.0 Object Library Microsoft.-->
To use the features of a Microsoft Office application from an Office project, you must use the primary interop assembly (PIA) for the application. The PIA enables managed code to interact with a Microsoft Office application's COM-based object model.
When you create a new Office project, Visual Studio adds references to the PIAs that are required to build the project. In some scenarios, you might need to add references to additional PIAs (for example, if you want to use a feature of Microsoft Office Word in a project for Microsoft Office Excel).
This topic describes the following aspects of using the Microsoft Office PIAs in Office projects:
For more information about primary interop assemblies, see Primary interop assemblies.
Separate primary interop assemblies to build and run projects
Visual Studio uses different sets of the PIAs on the development computer. These different sets of assemblies are in the following locations:
A folder in the program files directory
These copies of the assemblies are used when you write code and build projects. Visual Studio installs these assemblies automatically.
The global assembly cache
These copies of the assemblies are used during some development tasks, such as when you run or debug projects. Visual Studio does not install and register these assemblies; you must do this yourself.
Primary interop assemblies in the program files directory
When you install Visual Studio, the PIAs are automatically installed to a location in the file system, outside of the global assembly cache. When you create a new project, Visual Studio automatically adds references to these copies of the PIAs to your project. Visual Studio uses these copies of the PIAs, instead of the assemblies in the global assembly cache, to resolve type references when you develop and build your project.
These copies of the PIAs help Visual Studio avoid several development issues that can occur when different versions of the PIAs are registered in the global assembly cache.
Starting with Visual Studio 2017, these copies of the PIAs are installed to following shared locations on the development computer:
%ProgramFiles%Microsoft Visual StudioSharedVisual Studio Tools for OfficePIA
%ProgramFiles(x86)%Microsoft Visual StudioSharedVisual Studio Tools for OfficePIAon 64-bit operating systems)
For older versions of Visual Studio, these PIAs will be installed to the Visual Studio Tools for OfficePIA folder under the
%ProgramFiles% folder for that version of Visual Studio.For Example:
%ProgramFiles(x86)%Microsoft Visual Studio 14.0Visual Studio Tools for OfficePIA
Primary interop assemblies in the global assembly cache
To perform certain development tasks, the PIAs must be installed and registered in the global assembly cache on the development computer. Typically, the PIAs are installed automatically when you install Office on the development computer. For more information, see Configure a computer to develop Office solutions.
The Office PIAs are not required on end-user computers to run Office solutions. For more information, see Design and create Office solutions.
Use features of multiple Microsoft Office applications in a single project
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Every Office project template in Visual Studio is designed to work with a single Microsoft Office application. To use features in multiple Microsoft Office applications, or to use features in an application or component that does not have a project in Visual Studio, you must add a reference to the required PIAs.
In most cases, you should add references to the PIAs that are installed by Visual Studio under the
%ProgramFiles(x86)%Microsoft Visual StudioSharedVisual Studio Tools for OfficePIA directory. These versions of the assemblies appear on the Framework tab of the Reference Manager dialog box. For more information, see How to: Target Office applications through primary interop assemblies.
If you have installed and registered the PIAs in the global assembly cache, these versions of the assemblies appear on the COM tab of the Reference Manager dialog box. You should avoid adding references to these versions of the assemblies, because there are some development issues that can occur when you use them. For example, if you have registered different versions of the PIAs in the global assembly cache, your project will automatically bind to the version of the assembly that was registered last—even if you specify a different version of the assembly on the COM tab of the Reference Manager dialog box.
Some assemblies are added to a project automatically when an assembly that references them is added. For example, references to the
Microsoft.Vbe.Interop.dll assemblies are added automatically when you add a reference to the Word, Excel, Outlook, Microsoft Forms, or Graph assemblies.
Primary interop assemblies for Microsoft Office applications
The following table lists the primary interop assemblies that are available for Office 2016, Office 2013 and Office 2010.
|Office application or component||Primary interop assembly name|
|Microsoft Access 14.0 Object Library|
Microsoft Access 15.0 Object Library
|Microsoft Office 14.0 Access Database Engine Object Library|
Microsoft Office 15.0 Access Database Engine Object Library
|Microsoft Excel 14.0 Object Library|
Microsoft Excel 15.0 Object Library
|Microsoft Graph 14.0 Object Library (used by PowerPoint, Access, and Word for graphs)|
Microsoft Graph 15.0 Object Library
|Microsoft InfoPath 2.0 Type Library (for InfoPath 2007 only)||Microsoft.Office.Interop.InfoPath.dll|
|Microsoft InfoPath XML Interop Assembly (for InfoPath 2007 only)||Microsoft.Office.Interop.InfoPath.Xml.dll|
|Microsoft Office 14.0 Object Library (Office shared functionality)|
Microsoft Office 15.0 Object Library (Office shared functionality)
|Microsoft Office Outlook View Control (can be used in Web pages and applications to access your Inbox)||Microsoft.Office.Interop.OutlookViewCtl.dll|
|Microsoft Outlook 14.0 Object Library|
Microsoft Outlook 15.0 Object Library
|Microsoft PowerPoint 14.0 Object Library|
Microsoft PowerPoint 15.0 Object Library
|Microsoft Project 14.0 Object Library|
Microsoft Project 15.0 Object Library
|Microsoft Publisher 14.0 Object Library|
Microsoft Publisher 15.0 Object Library
|Microsoft SharePoint Designer 14.0 Web Object Reference Library||Microsoft.Office.Interop.SharePointDesigner.dll|
|Microsoft SharePoint Designer 14.0 Page Object Reference Library||Microsoft.Office.Interop.SharePointDesignerPage.dll|
|Microsoft Smart Tags 2.0 Type Library Note: Smart tags are deprecated in Excel 2010 and Word 2010.||Microsoft.Office.Interop.SmartTag.dll|
|Microsoft Visio 14.0 Type Library|
Microsoft Visio 15.0 Type Library
|Microsoft Visio 14.0 Save As Web Type Library|
Microsoft Visio 15.0 Save As Web Type Library
|Microsoft Visio 14.0 Drawing Control Type Library|
Microsoft Visio 15.0 Drawing Control Type Library
|Microsoft Word 14.0 Object Library|
Microsoft Word 15.0 Object Library
|Microsoft Visual Basic for Applications Extensibility 5.3||Microsoft.Vbe.Interop.dll|
Binding redirect assemblies
When you install and register the Office PIAs in the global assembly cache (either with Office or by installing the redistributable package for the PIAs), the binding redirect assemblies are also installed only in the global assembly cache. These assemblies help make sure that the correct version of the primary interop assemblies is loaded at run time.
For example, when a solution that references a Office 2010 assembly runs on a computer that has the Office 2013 version of the same primary interop assembly, the binding redirect assembly instructs the .NET Framework runtime to load the Office 2013 version of the primary interop assembly.
For more information, see How to: Enable and disable automatic binding redirection.