代码说明： TWebFileInfo retrieves information about a product that is on the product's home page. It can be used in your application to determine if a newer version of the product exists on the home page. If a newer version is available, TWebFileInfo can download a file via HTTP and run the update. This component is not designed to determine information on random files on random servers. Rather, the home page must be intentionally updated to provide the information to TWebFileInfo. 监测产品是否有新版本并自动更新

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