Как узнать browser по умолчанию?

{ 
  First we create a temporary file and call the 
  function FindExecutable to get the associated Application. 
} 
 
 
function GetAppName(Doc: string): string; 
var 
  FN, DN, RES: array[0..255] of char; 
begin 
  StrPCopy(FN, DOC); 
  DN[0]  := #0; 
  RES[0] := #0; 
  FindExecutable(FN, DN, RES); 
  Result := StrPas(RES); 
end; 
 
function GetTempFile(const Extension: string): string; 
var 
  Buffer: array[0..MAX_PATH] of char; 
  aFile: string; 
begin 
  GetTempPath(SizeOf(Buffer) - 1, Buffer); 
  GetTempFileName(Buffer, 'TMP', 0, Buffer); 
  SetString(aFile, Buffer, StrLen(Buffer)); 
  Result := ChangeFileExt(aFile, Extension); 
end; 
 
procedure TForm1.Button1Click(Sender: TObject); 
var 
  f: System.Text; 
  temp: string; 
begin 
  // get a unique temporary file name 
  // eine eindeutige Temporare Datei bekommen 
  temp := GetTempFile('.htm'); 
  // Create the file 
  // Datei erstellen 
  AssignFile(f, temp); 
  rewrite(f); 
  closefile(f); 
  // Show the path to the browser 
  // Pfad + Programmname zum Browser anzeigen. 
  ShowMessage(GetAppName(temp)); 
  // Finally delete the temporary file 
  // Temporaare Datei wieder loschen 
  Erase(f); 
end; 

//Using the Registry: 
//************************************************ 
 
uses 
  Registry; 
 
procedure TForm1.Button1Click(Sender: TObject); 
var 
  Reg: TRegistry; 
  KeyName: string; 
  ValueStr: string; 
begin 
  Reg := TRegistry.Create; 
  try 
    Reg.RootKey := HKEY_CLASSES_ROOT; 
    KeyName     := 'htmlfile\shell\open\command'; 
    if Reg.OpenKey(KeyName, False) then 
    begin 
      ValueStr := Reg.ReadString(''); 
      Reg.CloseKey; 
      ShowMessage(ValueStr); 
    end 
    else 
      ShowMessage('There is nоt a default browser'); 
  finally 
    Reg.Free; 
  end; 
end; 

//************************************************ 
{Copyright (c) by Code Central} 
 
type 
  TBrowserInformation = record 
    Name: string; 
    Path: string; 
    Version: string; 
  end; 
 
function LongPathName(ShortPathName: string): string; 
var 
  PIDL: PItemIDList; 
  Desktop: IShellFolder; 
  WidePathName: WideString; 
  AnsiPathName: AnsiString; 
begin 
  Result := ShortPathName; 
  if Succeeded(SHGetDesktopFolder(Desktop)) then 
  begin 
    WidePathName := ShortPathName; 
    if Succeeded(Desktop.ParseDisplayName(0, nil, PWideChar(WidePathName), 
      ULONG(nil^), PIDL, ULONG(nil^))) then 
 
      try 
        SetLength(AnsiPathName, MAX_PATH); 
        SHGetPathFromIDList(PIDL, PChar(AnsiPathName)); 
        Result := PChar(AnsiPathName); 
 
      finally 
        CoTaskMemFree(PIDL); 
      end; 
  end; 
end; 
 
function GetDefaultBrowser: TBrowserInformation; 
var 
  tmp: PChar; 
  res: LPTSTR; 
  Version: Pointer; 
  VersionInformation: Pointer; 
  VersionInformationSize: Integer; 
  Dummy: DWORD; 
begin 
  tmp := StrAlloc(255); 
  res := StrAlloc(255); 
  Version := nil; 
  try 
    GetTempPath(255, tmp); 
    if FileCreate(tmp + 'htmpl.htm') <> -1 then 
    begin 
      if FindExecutable('htmpl.htm', tmp, res) > 32 then 
      begin 
        Result.Name := ExtractFileName(res); 
        Result.Path := LongPathName(ExtractFilePath(res)); 
        // Try to determine the Browser Version 
        VersionInformationSize := GetFileVersionInfoSize(Res, Dummy); 
        if VersionInformationSize > 0 then 
        begin 
          GetMem(VersionInformation, VersionInformationSize); 
          GetFileVersionInfo(Res, 0, VersionInformationSize, VersionInformation); 
          VerQueryValue(VersionInformation, ('StringFileInfo040904E4ProductVersion'), 
            Pointer(Version), Dummy); 
          if Version <> nil then 
            Result.Version := PChar(Version); 
          FreeMem(VersionInformation); 
        end; 
      end 
      else 
        ShowMessage('Cannot determine the executable.'); 
      SysUtils.DeleteFile(tmp + 'htmpl.htm'); 
    end 
    else 
      ShowMessage('Cannot create temporary file.'); 
  finally 
    StrDispose(tmp); 
    StrDispose(res); 
  end; 
end; 

Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php