Thanks for the reply! i got the solution...


@echo off & setLocal EnableDelayedExpansion
cd D:\apps\Infa\param\
if exist "%1".prm del /F "%1".prm
for /f "tokens=* delims= " %%a in ('dir/b/a-d/o/n D:\apps\Infa\param\"%1_"*.prm') do (
ren %%a "%1".prm
goto :eof
)