[AeroX]

hmm,
ich habs selbst gelöst,

@echo off
for /F "tokens=*" %%a in ('dir /b *.wmv') do call :cache %%a
echo erledigt!
pause>nul
exit
:cache
set name=%1
if "%name:~1%"==".wmv" set cols=%name:~0,1%
if "%name:~2%"==".wmv" set cols=%name:~0,2%
if "%name:~3%"==".wmv" set cols=%name:~0,3%
if "%name:~4%"==".wmv" set cols=%name:~0,4%
if "%name:~5%"==".wmv" set cols=%name:~0,5%
if "%name:~6%"==".wmv" set cols=%name:~0,6%
if "%name:~7%"==".wmv" set cols=%name:~0,7%
if "%name:~8%"==".wmv" set cols=%name:~0,8%
if "%name:~9%"==".wmv" set cols=%name:~0,9%
if "%name:~10%"==".wmv" set cols=%name:~0,10%
if "%name:~11%"==".wmv" set cols=%name:~0,11%
if "%name:~12%"==".wmv" set cols=%name:~0,12%
if "%name:~13%"==".wmv" set cols=%name:~0,13%
if "%name:~14%"==".wmv" set cols=%name:~0,14%
if "%name:~15%"==".wmv" set cols=%name:~0,15%
if "%name:~16%"==".wmv" set cols=%name:~0,16%
if "%name:~17%"==".wmv" set cols=%name:~0,17%
if "%name:~18%"==".wmv" set cols=%name:~0,18%
if "%name:~19%"==".wmv" set cols=%name:~0,19%
if "%name:~20%"==".wmv" set cols=%name:~0,20%
rename %name% %cols%