Describe the bug

When using TopLevel.StorageProvider.SaveFilePickerAsync on Windows 11 to select a file path that exceeds the MAX_PATH limit, the storage provider correctly returns a BclStoragePath object. This object's internal path correctly uses the \\?\ prefix to support long paths.

However, an exception is thrown when attempting to access the .Path property (which is a Uri) of the returned IStorageFile object. It seems the Uri constructor or a related component does not correctly handle the \\?\ prefix when calculating the property, leading to an exception.

System.UriFormatException: Invalid URI: The hostname could not be parsed.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions)
   at System.Uri..ctor(String uriString)
   at System.UriBuilder.get_Uri()
   at Avalonia.Platform.Storage.FileIO.StorageProviderHelpers.UriFromFilePath(String path, Boolean isDirectory)
   at Avalonia.Platform.Storage.FileIO.BclStorageItem.GetPathCore(FileSystemInfo fileSystemInfo)
   at Avalonia.Platform.Storage.FileIO.BclStorageItem.get_Path()
   at Archon.DataCharting.ViewModels.ScottPlotDataChartingViewModel.HandleExportPackageByTime() in D:\CYTEKRepos\archon.tools\Archon.DataCharting\ViewModels\ScottPlotDataChartingViewModel.cs:line 2494

To Reproduce

1. On Windows 11, run an Avalonia app.
2. Call TopLevel.StorageProvider.SaveFilePickerAsync.
3. In the dialog, save a file to a location with a very long path (e.g., nested folders exceeding 260 characters).
4. Try to access the .Path property of the IStorageFile object returned by the picker.

                var file = await TopLevel.StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
                {
                    Title = "Save Package",
                    SuggestedFileName = $"ExportedData_{DateTime.Now:yyyyMMddHHmmss}",
                    DefaultExtension = "zip",
                    FileTypeChoices = [new FilePickerFileType("Zip File") { Patterns = ["*.zip"] }]
                });

                if (file == null) return;
                var fileName = file.Path.LocalPath;

Expected behavior

The IStorageFile.Path property should successfully return a Uri object representing the long path, without throwing an exception.

Avalonia version

11.3.2

OS

Windows

Additional context

No response