Delphi更改文件的扩展名并保存，比如，本代码中的默认文件扩展名为ICO，程序将其改为BMP，演示如何截取文件扩展名并修改扩展名后保存文件属性。-Delphi change file extensions and save, for example, the code in the default file extension for ICO, the program will read BMP, demonstrates how to intercept the file extension