Talking about legacy

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I was searching “UDK“ to see if I had UDK installed on one of my PCs, and noticed there is this same pair of assets used by UE4.1, UT4 (UE4.15), UE5.5…

I don’t have other UE installed on it (and yeah 4.1 was installed recently just to check some old stuff from years ago), but safe to say these assets have been around for a long time. Judging by the name, I suppose they were created for UDK.

But then, they are not in UDK 2014 or 2015. I just did a quick search, no such files