This version is required to run older Windows applications (like those built for Windows 7 or early Windows 10) and is often pre-installed on modern Windows systems. How to Check Your Actual Version
If legitimately packaged, the archive might include one or more of the following: net framework 4.0.30319.rar
Microsoft officially distributes .NET as .exe or .msi web installers. But .rar means someone—an IT admin, a modder, or a retro gamer— (typically dotNetFx40_Full_x86_x64.exe ) plus maybe: This version is required to run older Windows