List only files in the current folder and subfolder inside it.

listonlyeveryfiles

dir /b /o:n /s /a:-d > onlyfilespls.txt

From https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/dir

/b: Displays a bare list of directories and files, with no additional information. The /b parameter overrides /w.
/o:n: Sorts the output according to name (alphabetically).
/s: Lists every occurrence of the specified file name within the specified directory and all subdirectories.
/a:-d: Displays only the names of those files. -d means excluding directories.

Get-ChildItem -Recurse -File | Sort-Object | ForEach-Object { $_.FullName }

PowerShell equivalent.