: Indicates a combined "OEM" (Original Equipment Manufacturer) and "Retail" installation media, designed to support both license types.

: The specific OS build number identifying the GA version.

: "x64" denotes the 64-bit architecture, while "FRE" stands for "Free" (the standard retail/production version, as opposed to a "Checked" or debug version). en : Specifies the English language edition. Core Advancements in Windows Server 2025