procedure TForm1.FindAllFiles(Sender: TOBject);
var sr: TSearchRec;
begin
FindFirst(<YOUR PATH HERE>+'\*.*',(faAnyFile),sr);
begin
if ExtractFileExt(sr.FindData.cFileName) <> '' then
Combobox1.Items.Add(sr.FindData.cFileName);
end;
while FindNext(sr) = 0 do
begin
if ExtractFileExt(sr.FindData.cFileName) <> '' then
Combobox1.Items.Add(sr.FindData.cFileName);
end;
FindClose(sr);
end;