如题

There are two files that can be included in your game's base directory to customize the build.
icon.ico The icon that is used on Windows.
icon.icns The icon that is used on Macintosh.
These icon files much be in specific formats. You'll need to use a program or web service (such ashttp://iconverticons.com/ ) to convert them.
大意就是在base目录里面的icon.ico和icon.icns会自动被识别为在Win和Mac上面使用的图标文件