通常也正是这样- - -可执行的程序字节放在一个远离其他数据的特殊内存区域。
This is typically how it is-executable software bytes are stored in a special area away from the rest of the data.
文件PkgInfo包含8个字节，告诉查找程序这个包是可执行的，还是要用其他应用程序打开。
The file PkgInfo contains 8 bytes that tell the finder whether the package is something to run or to open with another application.
前 446 个字节是主引导加载程序，其中包含可执行代码和错误消息文本。
The first 446 bytes are the primary boot loader, which contains both executable code and error message text.
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