Как узнать путь к программе, если известно её имя?

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  TlHelp32;

function GetExeFilePath(ExeFileName: String): String;
var
  hSnapshot, hSnapshot2: THandle;
  Proc: TProcessEntry32;
  m: TModuleEntry32;
begin
  Result := '';
  hSnapshot := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
  try
    proc.dwSize := Sizeof(proc);
    if Process32First(hSnapshot, proc) then
    repeat
      if AnsiSameText(proc.szExeFile, ExeFileName) then
      begin
        hSnapshot2 := CreateToolhelp32Snapshot(TH32CS_SNAPMODULE,
          proc.th32ProcessID);
        try
          m.dwSize := SizeOf(TModuleEntry32);
          if Module32First(hSnapshot2, m) then
          begin
            Result := m.szExePath;
            Exit;
          end;
        finally
          CloseHandle(hSnapshot2);
        end;
      end;
    until not Process32Next(hSnapshot, proc);
  finally
    CloseHandle(hSnapshot);
  end;
end;