installscript.qs

function Component() {
    if (installer.isInstaller()) {
        component.loaded.connect(this, Component.prototype.installerLoaded);
        ComponentSelectionPage = gui.pageById(QInstaller.ComponentSelection);

        if (systemInfo.productType === "windows")
            installer.setDefaultPageVisible(QInstaller.StartMenuSelection, true);
    }
}

Component.prototype.createOperations = function()
{
    component.createOperations();
    if (systemInfo.productType === "windows") {
        component.addOperation("CreateShortcut", 
                                "@TargetDir@/analyser.exe", 
                                "@DesktopDir@/analyser.lnk",
                                "workingDirectory=@TargetDir@", 
                                "iconPath=@TargetDir@/icon.ico",
                                "description=Eagle AI");
    } else {
        component.addOperation("CreateDesktopEntry", 
            "Eagle AI.desktop", 
            "Type=Application\nTerminal=false\nExec=@TargetDir@/analyser.sh\nName=Eagle AI\nIcon=@TargetDir@/icon.ico");
    }
}

package.xml

<Package>
    <DisplayName>Core</DisplayName>
    <Description>Main app</Description>
    <Version>0.18.1</Version>
    <ReleaseDate>2021-01-30</ReleaseDate>
	<Default>true</Default>
    <Required>true</Required>
    <Script>installscript.qs</Script>
    <RequiresAdminRights>false</RequiresAdminRights>
</Package>