Issue with environment variable in batch script - batch-file

Question

So, I have probably a simple question but I cannot seem to find an easy answer.
Issue: I have a file that contains a set of lines such as:
%windir%\file.exe
%windir%\file2.dll
and so forth...
What I am trying to do is echo the actual file path to a second file such that the resulting output would be something like:
C:\Windows\file.exe
C:\Windows\file2.dll
and so forth...
The actual source file could have other variables such as %programfiles% but all of them have a resulting actual path.
I am currently using a for /f loop but when I echo the variable, I just get the environment variable returned rather than the actual path to the file.
Is there a solution out there for batch scripting?
The actual script is below. Note I am all for making this more efficient as time to get the information is important.
#echo off
setlocal enabledelayedexpansion
reg.exe query "HKLM\System\CurrentControlSet\Services" >> registry_hklm_installed_services_tmp.txt 2>nul
reg.exe query "HKLM\System\ControlSet001\Services" >> registry_hklm_installed_services_tmp.txt 2>nul
reg.exe query "HKLM\System\ControlSet002\Services" >> %temp_outpath%\registry_hklm_installed_services_tmp.txt 2>nul
reg.exe query "HKLM\System\ControlSet002\Services" >> registry_hklm_installed_services_tmp.txt 2>nul
for /f "delims=?" %%a in (registry_hklm_installed_services_tmp.txt) do (
set regkey=%%a
call :getvalue
)
goto :parsereg
:getvalue
reg.exe query "!regkey!\Parameters" /v ServiceDll > nul 2>&1 && goto regkeyexist
goto :eof
:regkeyexist
for /f "tokens=2*" %%b in ('reg.exe query "!regkey!\Parameters" /v ServiceDll') do set ImagePath=%%c
call :regag
goto :eof
:regag
echo !ImagePath! >> registry_hklm_installed_services_tmp2.txt
goto :eof
:parsereg
for /f "delims=?" %%a in (registry_hklm_installed_services_tmp2.txt) do echo %%a >> registry_hklm_installed_services_tmp3.txt

Answer 1

You can use the for /f command to cycle through the lines in the file like you are doing, and pass the line from the file to a subroutine inside the batch file, which will resolve it while it is being passed. Give the following:
Test.txt
%windir%\test.txt
%programfiles%\Test2.txt
This batch file will resolve the environment variables:
#echo off
setlocal ENABLEDELAYEDEXPANSION
for /f "delims=" %%i in (Test.txt) do call :Expand "%%i"
endlocal
goto TheEnd
:Expand
set _var=%1
echo !_var:"=!
:TheEnd
This is how the output looks when you run it:
c:\>Test.bat
C:\Windows\test.txt
C:\Program Files (x86)\Test2.txt
You can redirect the result to a new text file like this:
Test.bat > NewFile.txt
Or you can modify the original Test.bat to output the modified filename under Expand instead of echoing it to the console. It is important to include the quotes around %%i ("%%i") or spaces in the resolved paths will break into multiple variables when calling Expand (e.g., %1, %2, %3, etc.). The !_var:"=! removes the quotes.

Answer 2

This will also expand the variables.
#echo off
for /f "delims=" %%a in (Test.txt) do call echo %%a
pause
Test.txt
%windir%\test.txt
%programfiles%\Test2.txt

Answer 3

#ECHO OFF
SETLOCAL
FOR /f "delims=" %%a IN (q22726616.txt) DO (
FOR /f "delims=" %%b IN ('echo %%a') DO (
ECHO %%b
)
)
GOTO :EOF
I used a file named q22726616.txt containing your data for my testing.
[fixed following response - %%b line]