### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a bug report that matches the one I want to file, without success.

### Electron Version

16.0.0

### What operating system are you using?

Windows

### Operating System Version

WIN10 20H2

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

 win.webContents.savePage('d:/aaaaaa.html', 'HTMLComplete').then(() => {
      console.log('Page was saved successfully.')
    }).catch(err => {
      console.log(err)
    })

it will generate a html page file at d: 

### Actual Behavior

savePage has three formats that can be used

if use HTMLComplete
 only produced a aaaaaa_files empty folder

if use HTMLonly 
No files are generated nor error callbacks are generated

MHTML option works fine

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
return ontents()->IsCrashed();
}
void WebContents::ForcefullyCrashRenderer() {
  content::RenderWidgetHostView* view =
      ontents()->GetRenderWidgetHostView();
  if (!view)
    return;
  content::RenderWidgetHost* rwh = view->GetRenderWidgetHost();
  if (!rwh)
    return;
  content::RenderProcessHost* rph = rwh->GetProcess();
  if (rph) {
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
     A generic |CrashDumpHungChildProcess()| is not implemented for Linux.
     Instead we send an explicit IPC to crash on the renderer's IO thread.
    rph->ForceCrash();
#else
     Try to generate a crash report for the hung process.
#ifndef MAS_BUILD
    CrashDumpHungChildProcess(rph->GetProcess().Handle());
#endif
    rph->Shutdown(content::RESULT_CODE_HUNG);
#endif
  }
}
void WebContents::SetUserAgent(const std::string& user_agent) {