如果您听说过将文件扩展名从EXE改为COM，您可能会想知道它是否只能处理少数几个罕见的文件，或者是否可以处理几乎所有的EXE文件。今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者RoyiNamir想知道EXE文件扩展名是否总是可以替换为COM文件扩展名？:

Our antivirus software refused to let me copy an EXE file into my Windows 7 startup folder (calc.exe, for example) since it is an EXE file. I then changed the file extension from EXE to COM on the file and was able to easily copy it into the folder without problems (very professional).

And of course, calc.com works just as well as calc.exe, which got me to wondering. When will a program with an EXE file extension not work when the extension is changed to COM? Almost every EXE file that I have checked has worked. I would love to know the reas*** for the “why and why not” of the matter.

EXE文件扩展名是否总是可以替换为COM文件扩展名？

答案

超级用户贡献者Math Man为我们提供了答案：

It has to do with the internal format of the file. Originally, COM files were simple memory images and EXE files had lots of headers associated with them. As a result, you could not rename them.

As time went on and they had to make things backward compatible, Microsoft changed it so that the operating system looks at the file itself to determine what type of file it is instead of the extension. As a result, when you run the renamed file, Windows ignores the extension entirely.

Visit the links below for a more detailed and extensive explanation.

What is the Difference Between .com, .exe, and .bat? [StackOverflow]

What’s the difference between the COM and EXE extensi***? [Microsoft Developer Blog]

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