window_open_2.cs

<button (click)="downloadAndDisplayPdf"> open your pdf </button>

private async downloadAndDisplayPdf(): void {
  const win = window.open("", "_blank")
  Manager.GetIllustrationDownload()
  .then((response) => {
    If (win) {
      // these lines let us take a pdf file and get a blob url that we can use to navigate to it directly in browser
      const pdfFile = new File([response.fileContent], response.fileName, { type: 'application/pdf', lastModified: Date.now() });
      const objectURL = URL.createObjectURL(pdfFile);
 
      win.location = objectURL; // Navigate after async completes
    }
  });
}