.VWI File

The vwi file extension is associated with the Microsoft SharePoint, a web application platform in the Microsoft Office server suite available for Microsoft Windows Server operating system.

The vwi file stores workflow diagram created in the Microsoft SharePoint apps. May be a little outdated format actually.

How to open:

Use Microsoft SharePoint, or Visio to open and possibly edit *.vwi files.

How to convert:

Perhaps these diagrams could have been printed as PDFs using the original tool.