function GetModuleFileNameExW(hProcess:THandle; hModule:HMODULE; lpFilename:PWideChar; nSize:DWORD):DWORD; stdcall; external 'PSAPI.DLL';
function WindowGetEXE(wnd:HWND):string;
var
 wt:array[0..MAX_PATH-1] of WChar;
 r:integer;
 prc:THandle;
 prcID:cardinal;
begin
 result:='';
 if GetWindowThreadProcessID(wnd,prcID)<>0 then
 begin
 prc:=OpenProcess(PROCESS_ALL_ACCESS,false,prcID);
 if prc<>0 then
 try
  r:=GetModuleFileNameExW(prc,GetWindowLong(wnd,GWL_HINSTANCE),wt,MAX_PATH*2);
  if r=0 then r:=GetModuleFileNameExW(prc,0,wt,MAX_PATH*2);
  if r<>0 then result:=wt;
 finally
  CloseHandle(prc)
 end
 end
end;
function SetProcessDebugPrivelege:boolean;
var
 hToken:THandle;
 tp:TTokenPrivileges;
 rl:cardinal;
begin
 result:=false;
 if not OpenProcessToken(GetCurrentProcess,TOKEN_ADJUST_PRIVILEGES,hToken) then exit;
 try
  if not LookupPrivilegeValue(nil,'SeDebugPrivilege', tp.Privileges[0].Luid) then exit;
  tp.Privileges[0].Attributes:=SE_PRIVILEGE_ENABLED;
  tp.PrivilegeCount:=1;
  result:=AdjustTokenPrivileges(hToken,false,tp,0,nil,rl) and (GetLastError=0)
 finally
  CloseHandle(hToken);
 end
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
 SetProcessDebugPrivelege;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(WindowGetExe(hWnd))
end;