[megaloman]

Код:

@Echo Off
	Set "Folder=Z:\Soft_In"
	Set "Mask=*.*"
	Set "Fname=file.txt"
	
	FOR %%f IN ("%Folder%\%Mask%") DO (
		If /I Not "%Fname%"=="%%~nxf" (
			>"%Temp%\%~nx0.tmp" (Echo WORD,1234,A,B,C)
			>nul Copy /B "%Temp%\%~nx0.tmp"+"%%f" "%%~dpf\%Fname%"
			Del "%%f" "%Temp%\%~nx0.tmp" 
			Exit /B
		)
	)
Exit /B