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To create a file stream, which is an instance of
the FileStream class, you send a pathName: message to
the File class with a file-specifying string. Unlike most
instance-creation methods, pathName: creates an instance of a class
different from that of the receiver:
*-- File-specifying string
v
-----------
File pathName: 'vtbls.dta'
--------------------------
^
*-- FileStream instance