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A comment on 3-character filename extensions. Parent comment

Re:3-character filename extensions by dahdum on Monday July 14, 2014 @09:37PM (#8034289)
Right click a text file (such as "example.txt") and try to rename to ".gitignore". You get an error popup dialog "Rename: You must type a file name."

That's what he means...you can create it in various applications though.

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Re:3-character filename extensions by lucb1e on Monday July 14, 2014 @10:17PM (#8034378)
That is the most annoying error ever. No, I must not! I shall decide for myself what I must and mustn't do! /me opens cmd.exe and uses ren untitled.txt .gitignore

A slightly bigger challenge is a file named CON :)

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Re:3-character filename extensions by nik41tkins on Monday July 14, 2014 @11:24PM (#8034601)
Or .... , but that one is fairly easy as long as you COPY from the CONsole to a <fileName>. And remember ^Z to save and quit.
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