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This is a 227 added feature, did you install the latest 227i patch?
was only able to open with WinRar itself even though 7zip should be able to open .rar files. You might wanna consider making this a normal .zip file instead so it's easily accessible to more people.
Downloaded the UnrealVR_Vortex_Rikers_Tour.rar but 7zip is unable to open the archive at all.