本软件有个小窗口，将需要改名的文件拖放到该窗口上松手即可实现文件后缀名的更改。使用者需要自己编译该程序，并按照自己的需求设置要改成的后缀名。-The software has a small window, will need to rename the file into the window to let go can be realized on the file extension changes. Users need to compile the program, and set u