setlocal disableDelayedExpansion
for /f "delims=" %%A in ('forfiles /s /m * /c "cmd /c echo @relpath"') do (
  set "file=%%~A"
  setlocal enableDelayedExpansion
  echo !file:~2!
  endlocal
)

"script.bat"
"video01.mp4"
"video02.webm"
"video03.avi"
"exportfolder"
"exportfoldervideo04.avi"
"exportfoldervideo05.mpg"

1. "video01.mp4"
2. "video02.webm"
3. "video03.avi"
4. "exportfoldervideo04.avi"
5. "exportfoldervideo05.mpg"

set /p choice=What is the file you want to use ?
if %choice%==1 set file=indexlist1
if %choice%==2 set file=indexlist2
if %choice%==3 set file=indexlist3
if %choice%==4 set file=indexlist4