VSTO File Type

- The quick facts

What are VSTO files and how to open them

Are you having problems opening a VSTO file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a VSTO file?

A .VSTO file is a Visual Studio Tools For Office Add-in file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open VSTO files

Important: Different programs may use files with the VSTO file extension for different purposes, so unless you are sure which format your VSTO file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 2 different VSTO openers which you will find listed below.

Last updated: December 15, 2021

Various apps that use files with this extension

These apps are known to open certain types of VSTO files. Remember, different programs may use VSTO files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about VSTO file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.