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1 extension(s) and 0 alias(es) in our database. .vsto. VSTO file is a Microsoft Visual Studio Tools for Office Add-in. VSTO is an add-on to Microsoft Visual Studio that enables you to build application-level add-ins for applications in the Microsoft Office system. Other types of files may also use the .vsto file extension.
It is NOT installed by default. Visual Studio 2010 has a file format called VSIX which is basically a Visual Studio Extension (VSX was already taken by Visio). This extension format is intended to be a one-stop installer format for all things extensible. Things like add-ins, etc.