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Well, it's not a Windows bug.  Platforms are allowed to
insist on just about any restrictions they like for text
files, and it's on the user's head if they open a non-text
file in text mode.  The C standard leaves all behavior
undefined in such cases.  Text files on Windows have \r\n
line ends, and Windows isn't required to do anything in
particular if a file with even one \n line end is opened in
text mode.  It so happens that a lot of things work the same
way they work on Linux anyway, but not all.