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什么是DLL文件?
DLL文件又称“应用程序拓展”,是软件文件类型。在Windows中,许多应用程序并不是一个完整的可执行文件,它们被分割成一些相对独立的动态链接库,即DLL文件,放置于系统中。当我们执行某一个程序时,相应的DLL文件就会被调用。一个应用程序可有多个DLL文件,一个DLL文件也可能被几个应用程序所共用,这样的DLL文件被称为共享DLL文件。

DLL文件的作用?
在 Windows操作系统中,每个程序都可以使用该 DLL 中包含的功能来实现“打开”对话框。这有助于促进代码重用和内存的有效使用。 通过使用 DLL,程序可以实现模块化,由相对独立的组件组成。例如,一个记账程序可以按模块来销售。可以在运行时将各个模块加载到主程序中(如果安装了相应模块)。因为模块是彼此独立的,所以程序的加载速度更快,而且模块只在相应的功能被请求时才加载。 此外,可以更为容易地将更新应用于各个模块,而不会影响该程序的其他部分。例如,您可能具有一个工资计算程序,而税率每年都会更改。当这些更改被隔离到 DLL 中以后,您无需重新生成或安装整个程序就可以应用更新。
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What is a DLL file?
DLL is short of Dynamic Link Library, a library of executable functions or data that can be used by Windows applications. DLL provides one or more particular functions, program accesses the functions by creating either a static or dynamic link to the DLL. A static link remains constant during program execution while a dynamic link is created by the program as needed. DLLs can also contain just data. DLL files end with the extension .dll. 

How is a DLL file used?
A DLL file can be used by several applications at the same time. Some DLLs are provided with Windows System and available for any Windows based application. Other DLLs are written for a particular application and load when the application is running. 

Where are DLL Files typically located on my computer?
On a typical installation of Windows 95, 98, 98SE and ME DLL files are usually located in the C:WINDOWS or C:WINDOWSSYSTEM folders. In Windows based on NT technology DLL files can usually be found in C:WINNT or C:PROGRAM FILES folders.
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