exam文件百度了半天没有找到解决方案，很多人都是说用视频转换器打开，这些人都是不懂这个文件的格式，瞎猜的，用谷歌查询了一下“How to open .exam files ”，就出结果的
http://www.file-extensions.org/exam-file-extension对应的答案如下：
What is exam file? How to open exam files?
File type specification:
Various data file type
The exam file extension is related to the ProfExam, a software for Microsoft Windows operating system, which enables users to create tests and exams.
The exam file stores exam data from ProfExam.
打开软件就是这个“ProfExam”，this is final answer。