terse

@echo off
set m=10
setlocal enabledelayedexpansion
for /l %%i in (1,1,990) do (
     if exist "%%i.txt" (
        set /a n=num/m+1,num+=1
        md "!n!" 2>nul
        move "%%i.txt" "!n!\"
    )
)
pause
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