romrepomgr/RomRepoMgr/App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:RomRepoMgr"
             xmlns:resources="clr-namespace:RomRepoMgr.Resources"
             x:Class="RomRepoMgr.App">
    <Application.DataTemplates>
        <local:ViewLocator />
    </Application.DataTemplates>
    <Application.Styles>
        <FluentTheme /> <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml" />
    </Application.Styles>
    <NativeMenu.Menu>
        <NativeMenu>
            <NativeMenuItem Header="{x:Static resources:Localization.HelpMenuAboutText}"
                            Click="OnAboutClicked" />
            <NativeMenuItem Header="{x:Static resources:Localization.NativeMenuPreferencesText}"
                            Click="OnPreferencesClicked" />
            <NativeMenuItem Header="{x:Static resources:Localization.NativeMenuQuitText}"
                            Click="OnQuitClicked" />
        </NativeMenu>
    </NativeMenu.Menu>
</Application>