If you actually try using ico files in this format, you'll find that a number of popular icon-authoring tools crash when asked to load a PNG-compressed icon file for editing.
Since we had to break compatibility with the traditional format for ICO images, we may as well solve the problem we saw last time of people who specify an incorrect mask.
由于我们不得不违背了以前ico文件格式的兼容性，这也解决了上次提及的人们提供了错误mask的问题。
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We finish our tour of the evolution of the ICO file format with the introduction of PNG-compressed images in Windows Vista.