Files like WinUpdate.rar often contain "crafted" archives that exploit vulnerabilities in out-of-date extraction software. For example, a major flaw in older versions of WinRAR allowed attackers to execute code on a PC simply by the user opening a malicious archive. Because WinRAR does not automatically update itself, many users remain vulnerable to these types of attacks long after a patch is released. A New Era: Native Support
In reality, Microsoft never distributes system updates via standalone .rar files. Official updates are delivered through the service in Settings or the Windows Update Assistant .
: Using the recognized "Windows Update" branding.
