`@echo off
setlocal

set "basename=."
for /F "tokens=1* delims=." %%a in ('dir /B /A-D ^| sort /R') do (
   set "filename=%%a"
   setlocal EnableDelayedExpansion

   for /F "delims=" %%c in ("!basename!") do if "!filename:%%c=!" equ "!filename!" (
      set "basename=!filename!"
      md "!basename!"
   )
    move "!filename!.%%b" "!basename!"

   for /F "delims=" %%c in ("!basename!") do (
      endlocal
      set "basename=%%c

   )
)