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@echo off set count=1000 for /f "delims=" %%a in ('dir /s /b /a-d "A"') do ( set /a count+=1 call ren "%%a" "A-%%count:~-3%%.jpg" ) set count=1000 for /f "delims=" %%a in ('dir /s /b /a-d "B"') do ( set /a count+=1 call ren "%%a" "B-%%count:~-3%%.txt" ) set count=1000 for /f "delims=" %%a in ('dir /s /b /a-d "C"') do ( set /a count+=1 call ren "%%a" "C-%%count:~-3%%.ddb" ) set count=1000 for /f "delims=" %%a in ('dir /s /b /a-d "D"') do ( set /a count+=1 call ren "%%a" "D-%%count:~-3%%.dwg" )