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The (x64) allows you to run existing Windows desktop applications (WPF, Windows Forms) built with .NET 8.0. It is not a development kit — just for running apps.
Applications built with C#, Visual Basic, or F# often rely on this framework. microsoftnet desktop runtime 80 x64 2021
Significant improvements in Just-In-Time (JIT) compilation, garbage collection (GC), and native interop reduce application startup time and improve responsiveness for UI-heavy WPF and WinForms applications. The performance gains are particularly noticeable in real-world desktop usage scenarios, with measurable startup and throughput gains compared to earlier .NET releases. The (x64) allows you to run existing Windows
Installing the latest .NET Desktop Runtime is recommended as many games rely on .NET components, though you may need to retain older versions for compatibility with legacy software. garbage collection (GC)