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Dotnetfx 365.exe May 2026

A: Yes, fully compatible. Windows 11 still requires .NET 3.5 for legacy features. However, you may need to install via Windows Features first; only use dotnetfx 365.exe if the Features tool fails.

Close Visual Studio, SQL Server Management Studio, and any running games. .NET Framework installation requires a reboot and will fail if files are locked. dotnetfx 365.exe

Let's clarify the naming convention immediately. The file dotnetfx 365.exe is not an official Microsoft 365 component. Instead, it is almost universally a renamed or colloquially labeled installer for Microsoft .NET Framework 3.5 Service Pack 1 (SP1). A: Yes, fully compatible

If you found this file on your computer or received it via email/ download, it is likely one of the following: Close Visual Studio, SQL Server Management Studio, and

Starting with Windows 8, Microsoft removed .NET Framework 3.5 from the default operating system installation. While you can enable it via "Windows Features," that method requires an active internet connection to download files from Windows Update. If you are on a secure network without internet, or if Windows Update is broken, you need the offline installer—dotnetfx 365.exe.

Even if not prompted, reboot your system. Registry changes for .NET 3.5 require a fresh boot.