2010 Tools For Office Runtime -x64- ~repack~: Microsoft Visual Studio

Historically, Microsoft Office was exclusively 32-bit. However, with the release of Office 2010, Microsoft began pushing the x64 version to allow applications like Excel to address more than the 2 GB memory limit imposed by 32-bit address spaces. This shift necessitated a corresponding shift in the runtime environment for add-ins. A 64-bit process (Office) cannot load a 32-bit DLL (add-in). Consequently, the VSTO Runtime had to be compiled and provided as a native 64-bit component to bridge the gap between the Office application and the .NET Framework.

Are you trying to when loading an add-in?

Be aware of potential behavioral differences. While many .NET assemblies run identically on both 32-bit and 64-bit CLRs, some may behave differently due to factors like the significantly larger memory address space available to 64-bit processes. Perform rigorous testing of your 64-bit solution in a dedicated 64-bit environment. microsoft visual studio 2010 tools for office runtime -x64-

A set of unmanaged DLLs used by Office applications to load the runtime and your specific solution. Why You Need the x64 Version

[ 64-bit Windows OS ] │ ├──► Installed: 64-bit Office ──► Needs: VSTO Runtime x64 │ └──► Installed: 32-bit Office ──► Needs: VSTO Runtime x86 Historically, Microsoft Office was exclusively 32-bit

32-bit Windows Operating System with Microsoft Office x86 Version must be deployed.

The is a critical system component that allows 64-bit Windows operating systems to run Microsoft Office customizations built with Visual Studio 2010, 2012, 2013, 2015, and newer versions. Without this runtime engine, advanced Office add-ins, automation scripts, and document-level customizations cannot execute. What is the VSTO Runtime? A 64-bit process (Office) cannot load a 32-bit DLL (add-in)

You may see this warning when PIAs are being installed. Ignore it—the runtime itself will work with newer Office versions. You can suppress the warning by using the /quiet flag.

This distinction is fundamental to understanding the runtime's behavior. Since Office 2010, Microsoft has offered both 32-bit (x86) and 64-bit (x64) versions of Office itself. The architecture of your solution must align with the architecture of the Office installation:

Managed assemblies that allow your solution to communicate with Office applications Microsoft Learn Office Solution Loader: