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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 file extension is the set of three or four characters at the end of a filename; in this case, .vcs. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically.