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(C++ only) If the compiler cannot open a header file whose file name is
longer than 8 letters or whose file extension is longer than 3 letters, it
will truncate the name at 8 letters and the extension at 3 letters and try
to open a file with the shortened name.  This is the default behaviour for
the compiler.
For example, if the compiler cannot open the header file called STRSTREAM.H,
it will attempt to open a header file called STRSTREA.H.