China DOS Union

I first used FOR to rename .EXE to .EXE.BAK
@echo off
set pth=%cd%
for /r "%pth%" %%a in (*.EXE) do move /y "%%a" "%%a.BAK"

Later I wanted to try changing them back, but I don't know what's wrong with the statement below. I kept looking it over again and again, but it's still not right.
@echo off
set pth=%cd%
for /r "%pth%" %%a in (*.BAK) do (
set file=%%a
move /y "%%a" "%file:~0,-4%"
)
Could some expert give me some pointers?

@echo off

setlocal enabledelayedexpansion

set pth=%cd%

for /r "%pth%" %%a in (*.BAK) do (

set file=%%a

move /y "%%a" "!file:~0,-4!"

)

You didn't use delayed variable expansion.

Oh, thanks.