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。

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Delphi change the extension of the file and save, for example, the code in the default file extension ICO, the program will change it to BMP, demonstrates how to intercept and modify the file extension after extension to save the file attributes.