Help: How to add .NET Framework packages to WinPE 5.0 image?

Hi everyone, this is my first post.

I have written a batch file to build a (64-bit) WinPE 5.0 ISO using Windows ADK 8.0

I've attached the batch file to this post.

I'm attempting to add .NET Framework 4.5.1 to my WinPE image.  I downloaded a .NET Framework 4.5.1 redistributable and extracted the executable to find the relevant cab files:

Windows8-RT-KB2881468-x64.cab

WSUSSCAN.cab

Then tried to add those packages to the WinPE image but it fails.

How far off track am I?.... Can anyone point me in the right direction?

Regards,

Mitch

build.7z