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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.
VSTO, or Visual Studio Tools for Office, or Microsoft Visual Studio Tools is part of Microsoft's Visual Studio .NET tools suite and supports the Microsoft .NET Framework. It is used by developers to write code connecting Microsoft Office Word, Excel and Outlook applications. Developers using VSTO can employ C# or Visual Basic languages.