.app-file string
.app-file
(which may also be spelled `.file')
tells that we are about to start a new
logical file. string is the new file name. In general, the
filename is recognized whether or not it is surrounded by quotes `"';
but if you wish to specify an empty file name is permitted,
you must give the quotes--
""
. This statement may go away in
future: it is only recognized to be compatible with old
programs.
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