Unable to retrieve string list properties from files

[vgromfeld]

Description

The list of artists for an audio file is stored in the System.Music.Artist property as a list of strings.
We can get this property value using StorageItemContentProperties.RetrievePropertiesAsync.
When casting the returned property object with CsWinRT, the code is throwing an InvalidCastException.
This is working fine in a regular UWP application.
I tried other interfaces IEnumerable<string>, IList<string>, ICollection<string>, IReadOnlyCollection<string>,... but none of them are working 😟

Steps To Reproduce

Add the following code in a .NET9 UWP application:

var picker = new FileOpenPicker
{
    SuggestedStartLocation = PickerLocationId.MusicLibrary,
};
picker.FileTypeFilter.Add(".mp3");

var file = await picker.PickSingleFileAsync();
var properties = await file.Properties.RetrievePropertiesAsync(PropertyNames);

var value = (IReadOnlyList<string>)properties[FilePropertyNames.Artist]; // <--- throws InvalidCastException

I've checked all the following types and none of them are matching:

var type = properties[FilePropertyNames.Artist] switch
{
    IReadOnlyList<string> => "readonlylist",
    IReadOnlyCollection<string> => "readonlycollection",
    Windows.Foundation.Collections.IObservableVector<string> => "observable vector",
    IList<string> => "list",
    ICollection<string> => "collection",
    IEnumerable<string> => "enumerable",

    IReadOnlyList<object> => "readonlylist object",
    IReadOnlyCollection<object> => "readonlycollection object",
    Windows.Foundation.Collections.IObservableVector<object> => "observable vector object",
    IList<object> => "list object",
    ICollection<object> => "collection object",
    IEnumerable<object> => "enumerable object",
    _ => "unknown",
};

Expected Behavior

The returned list of strings should be castable to a .Net string list object

Version Info

TargetFramework = net9.0-windows10.0.26100.0
Microsoft.Windows.CsWinRT nuget = 2.2.0

Additional Context

Sample application: FileProperties.zip

[dongle-the-gadget]

This is a known issue at the moment, as CsWinRT does not support generic interface casting in AOT mode, which UWP .NET 9 enables.