The runtime is typically distributed as:
| Office Version | VSTO 2010 Runtime Support | Notes | |----------------|---------------------------|-------| | Office 2010 | ✅ Fully supported | Native target. | | Office 2013 | ✅ Supported | Requires update KB2764594. | | Office 2016 | ⚠️ Limited support | Works but not officially tested; may require registry tweaks. | | Office 2019/365| ❌ Not recommended | Use VSTO 2015 runtime or Office Add-in (Web) technology. | | Office 2007 | ✅ Supported (SP2+) | Requires .NET Framework 3.5 SP1. | vsto 2010 runtime
Microsoft ended Extended Support for the VSTO 2010 Runtime on July 14, 2020 . The runtime is typically distributed as: | Office
It is crucial to distinguish between the and the Development Tools . | | Office 2019/365| ❌ Not recommended |
VSTO 2010 uses a COM Shim (generated by the runtime) to act as a proxy between the unmanaged Office application and managed .NET code. This prevents version conflicts and allows multiple add-ins to coexist.
The VSTO 2010 runtime is 32-bit only internally. On 64-bit Office, it runs under WOW64.