The password seems to be "malte". The executable is completely unobfuscated .NET, and all you need for "reverse engineering" is ILSpy or DotPeek.

    public static void ExtractFile(string apbx, string file, string targetDir, bool recursive = false)
    {
      if (recursive)
        APBX.RunCommand("x \"" + file + "\" -o\"" + targetDir + "\" -p\"malte\" -y -r");
      else
        APBX.RunCommand("x \"" + apbx + "\" -o\"" + targetDir + "\" -p\"malte\" \"" + file + "\" -y -r-");
    }

    public static void ExtractArchive(string apbx, string targetDir, string exclude = null)
    {
      if (exclude != null)
        APBX.RunCommand("x \"" + apbx + "\" -o\"" + targetDir + "\" -p\"malte\" -x!\"" + exclude + "\" -y");
      else
        APBX.RunCommand("x \"" + apbx + "\" -o\"" + targetDir + "\" -p\"malte\" -y");
    }

Yikes, this alone is grounds to never ever ever use this tool, intentionally obfuscating what commands are being run is malware-level behavior

> Set the Archive format to 7z, and set malte as the password

https://docs.ameliorated.io/developers/playbooks/creation.ht...

password is "malte"

https://ibb.co/BNtHF1X