[amel27]

Код:

@echo off

set dri=c:\in
set dro=d:\out
set ex1=ext1
set ex2=ext2

xcopy "%dri%\*" "%dro%\" /T
for /r "%dri%" %%i in (*.%ex1%) do (
 set "out_p=%%~dpni"
 call set "out_p=%%out_p:%dri%=%dro%%%"
 call converter "%%i" "%%out_p%%.%ex2%"
)