Create folders:
data
DIM1
DIM-1
playerdata
region
stats
---------------------------------
Move files into world folder:
icon.png
level.dat
level.dat_old
session.lock
------------------------------
Files that go into "data"
Village.dat
villages.dat
villages_end.dat
villages_nether.dat
--------------------------------------
Files that go in "DIM1"
(nothing!)
-----------------------------------
Files that go in DIM-1
(nothing!)
----------------------------------------
Files that go in "playerdata"
4ac861a0-ab27-45d9-9911-8934f2fc633d.dat
-------------------------------------
Files that go in "region"
r.o.-1.mca
r.-1.-1.mca
r.-1.-2.mca
(well I don't have to keep going just anything like that)
-------------------------------------------------------------
Files that go in "stats"
4ac861a0-ab27-45d9-9911-8934f2fc633d.json
------------------------------------------------------------
Thats it!  Just run the world now and try it.  I put a lot of time in doing this!
I hope it works!