Microsoft Visual Studio Tools for Applications gives you a way to enable end users to customize your existing applications using Visual Basic and Visual C#. You can incorporate a custom integrated development environment (IDE) that is similar to the Visual Studio IDE into the application. End-user developers can use the IDE to customize the application by creating add-ins that extend the functionality of the application to meet their needs.
- DOWNLOAD: Microsoft Visual Studio Tools for Applications 2012 RTM – Preview
http://www.microsoft.com/en-us/download/details.aspx?id=30749
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