@echo off
for /f "delims=" %%a in (a.txt) do if not exist xxx\%%a.txt (echo %%a.txt>>缺少.txt) else echo %%a.txt
if exist 缺少.txt start 缺少.txt
pause

@echo off & setlocal EnableDelayedExpansion
set dd=%date:~8,2%
set mm=%date:~5,2%
set yyyy=%date:~,4%
set hh=%time:~,2%
set nn=10

for /f %%a in (order.txt) do (
     if !ss! equ 58 set /a nn+=1 & set ss=0
     set /a ss+=2
     start "" nircmd setfiletime "%%a.txt" "" "%dd%-%mm%-%yyyy% %hh%:!nn!:!ss!"
)