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//Aus der Delphi-Library um rekursiv nach Dateien zu suchen
procedure GetFilesInDirectory(ADirectory: string; AMask: String; AList: TStrings; ARekursiv: Boolean);
var
  SR: TSearchRec;
begin
  if (ADirectory<>'') and (ADirectory[length(ADirectory)]<>'\') then
    ADirectory:=ADirectory+'\';

  if (FindFirst(ADirectory+AMask,faAnyFile-faDirectory,SR)=0) then begin
    repeat
      if (SR.Name<>'.') and (SR.Name<>'..') and (SR.Attr<>faDirectory) then
          AList.Add(ADirectory+SR.Name)
    until FindNext(SR)<>0;
    FindClose(SR);
  end;

  if ARekursiv then
    if (FindFirst(ADirectory+'*.*',faDirectory,SR)=0) then
    begin
      repeat
        if (SR.Name<>'.') and (SR.Name<>'..') then
          GetFilesInDirectory(ADirectory+SR.Name,AMask,AList,True);
      until FindNext(SR)<>0;
      FindClose(SR);
    end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var templist : Tstringlist;
begin
templist:=tstringlist.create;
GetFilesInDirectory('C:\test\','*.*',templist,False);
showmessage(inttostr(templist.Count));
templist.free;
end;