@fcwilt

Re-deownloading didn't seem to do anything.

I just installed 7-Zip and that appears to have worked.

Windows 10 Explorer and WinRAR would throw an error when trying to extract them.

Got a Mini 5+ and am laying out an enclosure design in CAD

I can't seem to open the STEP model files located on the Hardware Overview page here:
https://duet3d.dozuki.com/Wiki/Duet_3_Mini_5plus_Hardware_overview

Both files fail to unzip on multiple different computers.