Microsoft-windows-netfx3-ondemand-package.cab -extra 〈PC PLUS〉

Meaning: Windows cannot find the source files. It is looking for the CAB, but your path is wrong, or the file is corrupted.

Solution with "-Extra" context: If your CAB is named ..._extra.cab, rename it to the exact canonical name: microsoft-windows-netfx3-ondemand-package.cab. Sometimes a download manager adds "extra" to the file extension (e.g., .cab.extra). Remove that.

There are two primary methods to use this file to install .NET Framework 3.5. Microsoft-windows-netfx3-ondemand-package.cab -Extra

To understand the file, we must break down its naming convention:

This CAB file is the offline installer for .NET Framework 3.5. It is typically found on your original Windows installation media (ISO, USB drive) inside the sources\sxs folder. Meaning : Windows cannot find the source files

Yes. For Windows Server Core (no GUI), the same CAB works, but you must manually start the Windows Installer service first. The command remains identical.

You generally do not download this .cab file from a standard website. It is located within the Windows Installation Media (ISO). This CAB file is the offline installer for

If you have a Windows 10 or Windows 11 ISO file (which can be downloaded freely from the Microsoft website), you can mount it as a virtual drive. Inside, navigate to the following folder structure:

DriveLetter:\sources\sxs\

Inside this folder, you will find a file named: microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab

Note: The filename might vary slightly depending on the architecture (amd64 for 64-bit, x86 for 32-bit).