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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.
1 Click 'Fix Now' button to fix and open your vsto file. 2  Download and Install Windows vsto File Error Repair Tool. 3  Update to the latest repair tool version.  Wait for the scan to be completed and then click 'Fix Now' button fix the Windows errors related to this file extension completely.