Conversely, if you have 32-bit Office installed on a 64-bit Windows system, you would actually need the x86 version of the runtime. System Requirements and Prerequisites
The is a critical software component required to run Microsoft Office-based solutions built using Visual Studio 2010 and newer versions. Specifically, the x64 version is designed for 64-bit editions of Microsoft Office, acting as a communication bridge between the .NET Framework and Office applications. What is the VSTO Runtime? microsoft visual studio 2010 tools for office runtime -x64-
This runtime supports solutions built for Office 2010, 2013, 2016, and newer versions. How to Install the Runtime Conversely, if you have 32-bit Office installed on
Before installing the VSTO 2010 Runtime, ensure your system meets these criteria: What is the VSTO Runtime
If you are running a 64-bit version of Microsoft Office on a 64-bit Windows OS, you must have the x64 VSTO Runtime installed.
Windows 7 SP1, 8.1, 10, 11, and various Windows Server editions (2012, 2016, 2019).
