The microsoft-windows-netfx3-ondemand-package.cab file is a Feature on Demand (FOD) package used to install .NET Framework 3.5 (which includes .NET 2.0 and 3.0) on Windows 10, Windows 11, and Windows Server without requiring an active internet connection.
While you can often install this via the Windows Features menu, the .cab file is specifically required for offline deployments, environments with restricted internet access, or automated SCCM/imaging tasks. Where to Download or Find the File
Microsoft does not typically offer this .cab file as a direct, standalone web download. Instead, it is retrieved from official installation media or specialized repositories: Installing .Net 3.5 on Windows 2012 R2 - Server Fault Microsoft-windows-netfx3-ondemand-package.cab Download
Enable-WindowsOptionalFeature -Online -FeatureName "NetFx3" -All -LimitAccess -Source "C:\temp"
.NET Framework 3.5 was released in 2007 alongside Windows Vista. Many business applications, games, and specialized tools were built specifically on this version. Even though Windows 10 and 11 ship with .NET Framework 4.8 (or newer), Microsoft does not include version 3.5 by default due to security and image size considerations.
When you try to install an old program that depends on .NET 3.5, Windows will attempt to download the required files from Windows Update. However, this fails in many scenarios: The microsoft-windows-netfx3-ondemand-package
That’s where the microsoft-windows-netfx3-ondemand-package.cab file comes in. It is the offline installer for .NET 3.5.
A: Yes. Windows 11 still requires .NET 3.5 for legacy apps. The CAB for Windows 10 version 21H2 or newer usually works on Windows 11. or official ISO images).
A: No. Only download from Microsoft-owned domains (*.microsoft.com, *.update.microsoft.com, or official ISO images).