[Package Issue]: MPC-BE.MPC-BE Version 1.9.0 - does it contain Trojan:Win32/Wacatac.H!ml ?

### Please confirm these before moving forward

- [x] I have searched for my issue and not found a work-in-progress/duplicate/resolved issue.
- [x] I have not been informed if the issue is resolved in a preview version of the winget client.

### Category of the issue

Installation issue.

### Brief description of your issue

Windows Defender blocked the extracted installer file as `Trojan:Win32/Wacatac.H!ml`
```
Affected items:
file: C:\Users\Username\AppData\Local\Temp\WinGet\MPC-BE.MPC-BE.1.9.0\extracted\MPC-BE.1.9.0.x64.exe
```

### Steps to reproduce

```
C:\>winget list MPC-BE.MPC-BE
Name ID Version Verfügbar Quelle
-------------------------------------------------------
MPC-BE x64 1.8.9 MPC-BE.MPC-BE 1.8.9 1.9.0 winget

C:\>winget upgrade MPC-BE.MPC-BE
Gefunden MPC-BE [MPC-BE.MPC-BE] Version 1.9.0
Diese Anwendung wird von ihrem Besitzer an Sie lizenziert.
Microsoft ist nicht verantwortlich und erteilt keine Lizenzen für Pakete von Drittanbietern.
Der Installer-Hash wurde erfolgreich überprüft
Archiv wird extrahiert...
Archiv erfolgreich extrahiert
Die geschachtelte Installerdatei ist nicht vorhanden. Stellen Sie sicher, dass der angegebene relative Pfad des geschachtelten Installers übereinstimmt: C:\Users\Username\AppData\Local\Temp\WinGet\MPC-BE.MPC-BE.1.9.0\extracted\MPC-BE.1.9.0.x64.exe

C:\>
```

### Actual behavior

The extracted installer file has been removed by Windows Defender so that it can't be found.

### Expected behavior

?

### Environment

```raw
Windows-Paket-Manager v1.29.280
© 2026 Microsoft. Alle Rechte vorbehalten.

Windows: Windows.Desktop v10.0.19045.7417
Systemarchitektur: X64
Paket: Microsoft.DesktopAppInstaller v1.29.280.0
```

### Screenshots and Logs

_No response_

Start by reproducing the `winget upgrade MPC-BE.MPC-BE` command and reviewing the MPC-BE.MPC-BE 1.9.0 package details alongside the Windows Defender detection for the extracted path shown in the issue. Determine whether the installer is incorrectly packaged or genuinely blocked, then document the confirmed cause and expected installation behavior.

Written by the indexing model from the issue text.