caj格式的文件需要CAJViewer软件才能打开，直接下载安装一个CAJViewer软件，就可以将文件打开了。方法如下：
1、在浏览器搜索框输入CAJViewer，然后点击中国知网的这一个搜索结果。
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2、进入中国知网之后，将CAJViewer下载到电脑上。
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3、然后找到刚刚下载的文件，双击将文件进行安装。
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4、安装成功之后点击完成就可以了。
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5、然后找到需要打开的caj格式的文件，直接将它打开即可。
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注意事项：
caj格式的文件一般是学术类的文件，可以直接在中国知网下载此软件。
caj文件怎么打开