Dotnetfx365.exe

is an executable file designed to install or repair various versions of the Microsoft .NET Framework, specifically targeting the needs of older applications. The "fx" in the name stands for "Framework," and "365" is a common suffix used by third-party repackagers to indicate a bundle containing multiple .NET versions (e.g., 3.5, 4.5, 4.6, 4.7, and 4.8) in a single installer.

Yes. It is only an installer, not a runtime component. Once .NET Framework is installed, the .exe is not needed for daily operation. Deleting it frees up disk space. dotnetfx365.exe