Microsoftwindowsclientlanguagepackx64enuscab

LanguagePack: Identifies the content as a set of language resource files.

The file name microsoft-windows-client-languagepack-package-amd64-en-us.cab refers to a specific Windows Cabinet (CAB) file used to install the English (United States) language pack on 64-bit (x64) versions of the Windows operating system. This package allows users and administrators to change the display language of the Windows interface, including menus, dialog boxes, and help topics. Understanding the File Components

.cab: The file extension for a Windows Cabinet file, a compressed archive format used for software installation and driver delivery. Why Use a .CAB File Instead of the Settings App?