.VSTO File

The vsto file extension is associated with Microsoft Visual Studio integrated development environment that allows programmers to create applications for Windows, .NET framework, internet applications etc.

The vsto file stores data for Microsoft Visual Studio Tools for Office runtime (VSTO abbreviation) used to create extensions for Microsoft Office.

Mime types:
application/x-ms-vsto

How to open:

Probably not meant to be accessed by the user.

How to convert:

The *.vsto file type cannot be converted to other file formats.