[DUG]: Is this bad programming practice or what?

[Alistair George]

I need to parse strings which include files and directories. If they are a
directory then I append global files.
My concern is (even though I have never met one yet) a filename with NO
extension. Would this be a concern??
code follows:

for tval := 0 to memo1.Lines.Count - 1 do
  begin
    with memo1.Lines do
    begin
      if ansipos('.', strings[tval]) = 0 then     //its a directory
        Strings[tval] := ZipMaster1.AppendSlash(strings[tval]) + '*.*';
    end;
  end;

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