Why can't we make CON, PRN,Null folder in windows? [duplicate]

Posted by TechnoKnol on Super User See other posts from Super User or by TechnoKnol
Published on 2013-06-28T18:51:58Z Indexed on 2014/08/20 22:24 UTC
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windows-7

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windows-explorer

This question already has an answer here:

Unable to rename a folder or a file as 'con' 8 answers

When i make new folder and rename it to nul it says The Specified device name is invalid.

then I searched which are the other folders we can't make, and get names con, nul, prn ?

what are these names stands for ? and why can't we make folders with these names ?

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