Separar una cadena en función de un delimitador Delphi

program Project28;

{$APPTYPE CONSOLE}

uses
  Classes,
  SysUtils;

procedure Split(Delimiter: Char; Str: string; ListOfStrings: TStrings) ;
begin
   ListOfStrings.Clear;
   ListOfStrings.Delimiter     := Delimiter;
   ListOfStrings.DelimitedText := Str;
end;


var
   OutPutList: TStringList;
begin
   OutPutList := TStringList.Create;
   try
     Split(':', 'word:doc,txt,docx', OutPutList) ;
     Writeln(OutPutList.Text);
     Readln;
   finally
     OutPutList.Free;
   end;
end.

Fuente: http://stackoverflow.com/questions/2625707/split-a-string-into-an-array-of-strings-based-on-a-delimiter