清单 5 中的第一部分告诉 Emacs，当装入带有特定扩展名的文件时，调用哪种主方式，这与 Windows 中根据文件类型关联应用程序的方法类似。
The first section of Listing 5 tells Emacs which major mode to invoke when you load a file with a particular extension, similar to the way Windows associates application based on file type.
使用Mike Wade所描述的技术，ClickOnce应用程序中也能关联文件类型了。
Using a technique described by Mike Wade, file types can also be associated with ClickOnce applications.
文件类型与Web Apps的关联。
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