Microsoft-windows-netfx3-ondemand-package.cab -extra (2026)

How to Install .NET Framework 3.5 Offline Using the NetFx3 CAB File

Why is the Microsoft-windows-netfx3-ondemand-package.cab file important?

  • Fixes:
    1. Centralized Source: Copy the legitimate CAB to a network share (e.g., \\fileserver\win_sources\netfx3\).
    2. Group Policy: Use Group Policy to point Windows to this share for Features on Demand. Navigate to: Computer Configuration -> Administrative Templates -> System -> Specify settings for optional component installation and component repair. Set the alternate source path.
    3. Task Sequence: In SCCM or MDT, run a PowerShell command during OSD: 
      Enable-WindowsOptionalFeature -Online -FeatureName NetFx3 -Source "\\server\share\sxs" -LimitAccess
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