: "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

: The specific OS build number identifying the GA version.

Understanding Windows Server 2025 (Build 26100.1742) The string refers to the General Availability (GA) build of Microsoft's latest server operating system, released on November 1, 2024 . This specific version marks the debut of Windows Server 2025 as a Long-Term Servicing Channel (LTSC) release. Breaking Down the Version String

Windows Server 2025 introduces significant upgrades in security, performance, and hybrid cloud integration. What's new in Windows Server 2025 | Microsoft Learn

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