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I just ran the new version (9.3.1) and I noticed that it created an image I don't recall seeing before: wsusoffline-enu-x86.iso

At 6,820,926KB in size, it's the largest of all the .iso images.

What are the contents of this image file?

Thanks!

Looks like you did check the 'x86 cross-product' box by accident. That's a combined image of the most-used OS targets.