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CCS代开的.c文件变成了纯文本文档是怎么回事?

起因:我用CCS5.5导入别人给的工程,发现.c文件里的中文注释是乱码,于是我根据网上经验做了如下操作:

做完以上操作之后,发现打开的.c文件变成了纯文本文件:


这怎么恢复回去啊?