The Microsoft-windows-netfx3-ondemand-package.cab file is a specialized "Feature on Demand" (FOD) package used to install .NET Framework 3.5 (including versions 2.0 and 3.0) on Windows 10, Windows 11, and Windows Server. This file is primarily utilized by IT administrators and advanced users who need to enable .NET features in offline or restricted environments where Windows Update is unavailable. Understanding the Package
Purpose: Many older applications require .NET Framework 3.5 to function. While modern Windows versions include .NET 4.x by default, the 3.5 version is provided as an optional component.
Deployment: This .cab file is often found within the \sources\sxs directory of a Windows installation ISO or DVD.
Version Sensitivity: A critical detail for users is that these packages are version-specific. For example, a .cab file from Windows 10 version 1803 will typically not work on version 1809. How to Obtain the File
There is no official, standalone direct download link for just this specific .cab file on the Microsoft website. Instead, it is obtained through the following methods: Microsoft-windows-netfx3-ondemand-package.cab Download
Cannot install/update .net 3.5 for Windows 10 - Microsoft Q&A
Understanding and Managing the Microsoft-Windows-NetFx3-OnDemand-Package.cab Download
The Microsoft-Windows-NetFx3-OnDemand-Package.cab file is a cabinet file used by the Windows operating system to distribute and install the .NET Framework 3.5 on demand. This package is crucial for running applications that require the .NET Framework 3.5, a significant component for many software applications developed before the widespread adoption of newer .NET Framework versions.
Once you have the .cab file (e.g., on your C:\ drive or a USB drive), you have two reliable methods to install it. The Microsoft-windows-netfx3-ondemand-package
microsoft-windows-netfx3-ondemand-package.cabIf you need .NET Framework 3.5 (which includes 2.0 and 3.0) on Windows 10 or 11, you may hit an error when trying to enable it via Windows Features. The most reliable offline method is using the microsoft-windows-netfx3-ondemand-package.cab file.
After restarting, open PowerShell and run:
Get-WindowsOptionalFeature -Online -FeatureName NetFx3
You should see State: Enabled.
Alternatively, check the Registry:
HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5 should exist. Solution: Re-download the CAB from an official source
Use DISM /Mount-Image, then DISM /Add-Package, then DISM /Commit-Image to inject the CAB directly into install.wim.
Do not download .cab files from random websites, forums, or third-party "DLL download" sites.
Microsoft does not provide a direct standalone download link for this specific .cab file on its website. It is officially distributed only through Windows Installation Media (ISO).
Downloading this file from unauthorized sources poses a severe security risk, as the file could be tampered with to include malware or ransomware.
Search for “NETFX3” on the official Microsoft Update Catalog. Look for the package matching your Windows version (e.g., “Feature On Demand for Windows 10 Version 22H2”).