public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;

        }

        public string[] Files
        {
            get => Directory.GetFiles(Environment.SystemDirectory, "*.png", SearchOption.TopDirectoryOnly);
            set { }
        }
    }

<Window x:Class="WpfApp4.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:WpfApp4"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="800" Height="450"
    WindowState="Maximized"
    mc:Ignorable="d">
    <Grid>
        <DataGrid AutoGenerateColumns="False" CanUserAddRows="False" CanUserDeleteRows="False"
            ItemsSource="{Binding Files}">
            <DataGrid.Columns>
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Image Width="96" Height="96"
                                Source="{Binding Mode=OneWay}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTextColumn Binding="{Binding Mode=OneWay}" />
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>