将驻留程序proj3_19添加到注册表的自动启动项，实现登陆自动执行驻留；使用SDK提供的函数编写窗口应用程序，在消息处理函数中设置定时器，当系统时间与设定的时间相同时，删除文件test.txt，实现固定时间删除某一文件；将notepad.exe赋给lpAppName，如有参数（可执行文件名）传人，追加到lpAppName后，删除文件test.txt,然后执行lpAppName中的命令，实现双击文本文件时，自动删除某一文件-The stay-resident program proj3_19 start automatically added to the registry entries, automatically achieve the landing presence　the use of SDK provides a function of write windows application, in the message handler set the timer, when the system time and set time with the same , delete the file test.txt, to achieve a fixed time to delete a file　to notepad.exe assign lpAppName, if any parameters (the executable file name) in their footsteps, appended to the lpAppName, delete the file test.txt, and then execute lpAppName of the order to achieve double-click the text file, automatically delete a file