So in etwa:
AutoIt
$s = FileRead("test.txt")
$s_new = ""
$a = StringSplit($s, @CRLF, 3)
For $i = 0 To UBound($a) - 2 Step 2
$s_new &= StringReplace(StringTrimLeft($a[$i], StringLen("#EXTINF:-1,NL: ")), " ", ".") & " " & $a[$i + 1] & @CRLF
Next
$s_new = StringTrimRight($s_new, 4)
FileWrite("test2.txt", $s_new)
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