net10.0-windows10.0.22621 
namespace System.IO.Packaging
{
    public class EncryptedPackageEnvelope : IDisposable
    {
        public static bool IsEncryptedPackageEnvelope(Stream stream);
    }
}
nuget.org
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Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
3.03.1
.NET Framework
3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net10.0
Platforms This API is only available when you target a specific platform:
Windows
7.08.010.0.1776310.0.1836210.0.1904110.0.2034810.0.2200010.0.22621
Information specific to net10.0-windows10.0.22621
Assembly

WindowsBase , Version=10.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs to set <UseWPF>True</UseWPF>.

Platform Restrictions

This API is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API