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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.
What to do if the file extension was infected by virus or malware. 1  Download and Install Windows vsto File Virus/Malware Removal Tool. 2  Click 'Start Scan' button to run a thorough scan for your computer system.  Click 'Remove Now' button to thoroughly remove any detected virus/malware.