Xtreegold reincarnated in ztreewin https://www.ztree.com/. It is not free but it is a native windows program. There is even a fan page with a list of clones resembling more or less to xtree https://www.xtreefanpage.org/x63clone.htm

I credit XTree with building some of my foundational CS intuition. At 11 y/o I became a master at grouping, filtering, tagging, inverting, summing subgroups (directories), and coming up with efficient routes to moving stuff around as we coped with our ever-stuffed 10MB drive.