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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.
A VSIX package is a .vsix file that contains one or more Visual Studio extensions, together with the metadata Visual Studio uses to classify and install the extensions. That metadata is contained in the VSIX manifest and the [Content_Types].xml file. A VSIX package may also contain one or more Extension.vsixlangpack files to provide localized setup text, and may contain additional VSIX packages to install dependencies.