Windows Server 2025.26100.1742-oemret-x64fre-en...

The string you're referring to describes an official evaluation or retail build

: Tightened default settings and improved integration with Defender for Identity.

: Dictates the licensing and media channel. This file contains unified bits serving both Original Equipment Manufacturer (OEM) factory installations and traditional standard Retail (RET) channel licenses. Windows Server 2025.26100.1742-OEMRET-x64FRE-en...

The build string refers to the Generally Available (GA) or RTM (Release to Manufacturing) version of Windows Server 2025 , specifically released around November 1, 2024 .

Windows Server 2025 is not a minor refresh. It introduces a broad range of features designed to modernize datacenters, enhance security, and improve performance for AI and cloud-native workloads. The string you're referring to describes an official

The extensive naming string ( Windows Server 2025.26100.1742-OEMRET-x64FRE-en-us ) acts as a precise identifier for enterprise IT infrastructure. Understanding each component of this identifier reveals its target market, installation constraints, and core architectural features. Decoding the Build String

Windows Server 2025 build 26100.1742 (OEMRET) now appearing The build string refers to the Generally Available

: Identifies standard 64-bit architecture built on the optimized Retail ("Free") compiler version, which strips out heavy kernel debugging code to maximize performance.

The directory services layer receives its first major overhaul in nearly a decade. This build unlocks a (up from the legacy 8K format), maximizing database efficiency and schema limits. Furthermore, the Kerberos protocol implementation has been updated to enforce stronger encryption baselines by default. Windows Server 2025 build 26100.1742 - BetaWiki

: The specific operating system build number ( 26100 ) and minor revision version ( 1742 ) that marks the final Release to Manufacturing (RTM) baseline.

: The specific servicing revision baseline compiled by Microsoft. This indicates that foundational cumulative updates—including security patches addressing multiple zero-day items—are natively baked directly into the underlying operational image layer.