Install Visio or access Visio for the web - Microsoft Support
Draw.io natively reads and writes .vsdx files (Visio format). It is 100% portable: Microsoft Visio Portable Download
Unofficial portable apps are often bundled with malware, spyware, or "backdoors" that can compromise your data. Legal & Licensing Issues: Install Visio or access Visio for the web
Before downloading anything, let’s define the term. A is a program that: Microsoft Visio Portable Download