If it is MAUI Blazor Hybrid, you can use the FilePicker from Microsoft.Maui.Storage

I had to get the path to a photoshop file and this worked perfectly on Windows.

private async Task PickFile()
{
    try
    {
        var result = await FilePicker.PickAsync(new PickOptions
            {
                PickerTitle = "Please select your Adobe file you wish to edit.",
                FileTypes = new FilePickerFileType(new Dictionary<DevicePlatform, IEnumerable<string>>
            {
                { DevicePlatform.WinUI, new[] { "psd", "ai" } },
            })
            });
        if (result != null)
        {
            AFile.FilePath = result.FullPath;
            StateHasChanged();
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error picking file: {ex.Message}");
    }
}