Importing first line of TXT files to a spreadsheet

Under Windows, you can do this with a batch file:

@echo off
setlocal enabledelayedexpansion

set OUTPUT=names.csv
del %OUTPUT% > nul 2>&1

for %%f in (*.txt) do (
    set /p NAME=< %%f
    echo %%f,!NAME! >> %OUTPUT%
)

endlocal

If you want the filename without the extension, change the for loop to this:

for %%f in (*.txt) do (
    set /p NAME=< %%f
    set INPUT=%%f
    echo !INPUT:~0,-4!, !NAME! >> %OUTPUT%
)