Absolutely! You can use a single install.xml to create installers for Windows, macOS, and Linux—tools like Install4j or IzPack are built for exactly this kind of cross-platform configuration. Let’s break down how to address both your needs:

1. Building Multi-Platform Installers with One Configuration File #

Most modern cross-platform installer frameworks let you embed platform-specific logic directly in your install.xml:

• IzPack: Wrap platform-specific resources, installation panels, or custom actions inside <os> tags to target specific operating systems. For example, you can define Windows-only desktop shortcuts or macOS-specific application bundle settings within the same XML file. The builder will parse these tags and activate the right components for each OS during the build.
• Install4j: Use conditional expressions (like sys.isWindows(), sys.isMacOS()) to tailor behavior and included resources per platform. You can create a single project file (exportable as XML) that handles all three systems, then build each platform’s installer separately from the same base config.

2. Generating Slim, OS-Exclusive .exe Files #

The bloated .exe issue occurs when the builder packages resources for all three platforms into one file—but you can fix this by explicitly restricting assets to the target OS:

• Install4j: When setting up your media output, select only the Windows platform in the media wizard. The tool will automatically exclude macOS/Linux resources (like native libraries, non-Windows JRE builds) from the generated .exe. You can repeat this process for macOS and Linux to get their respective lean installers, all from the same install.xml.

• IzPack: Use the os attribute on resource entries to limit them to specific systems. Here’s a quick example:

  <resources>
    <!-- Windows-only native library -->
    <res id="win-native" src="libs/windows/app.dll" os="windows"/>
    <!-- macOS-only native library -->
    <res id="mac-native" src="libs/mac/app.dylib" os="mac"/>
    <!-- Linux-only native library -->
    <res id="linux-native" src="libs/linux/app.so" os="unix"/>
  </resources>
  

  When building the Windows installer, IzPack will only include the Windows-specific resources, stripping out unnecessary cross-platform files to keep your .exe lightweight.

• Pro tip: If you’re wrapping a JAR to create the .exe, make sure to bundle a Windows-only JRE build instead of a universal cross-platform JRE. This alone will eliminate a huge portion of the bloat from non-Windows runtime files.

内容的提问来源于stack exchange，提问作者Yosra Gouaiel