| From Version | To .NET 9.0 | Notes | |--------------|--------------|-------| | .NET Core 3.1 | Not supported | EOL – must migrate to .NET 8.0 or 9.0 with breaking changes. | | .NET 6.0 (EOL Nov 2024) | Supported with retargeting | Some WinForms APIs changed; test thoroughly. | | .NET 8.0 LTS | Fully compatible | In-place upgrade via runtime rebinding – no source changes typically needed. |
Every update patches vulnerabilities that could allow malicious code to piggyback on legitimate processes. microsoft windows desktop runtime latest version