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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 28.4.1, p. III-465.
+% Original source in file "io1.TEX", starting line 910.
+\wlog{L: "fexist.tip" ["io1.TEX," l. 910, p. III-465]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newread\@FileExistsS
+\newif\if@FileExistsAnswer
+\def\FileExistsConditional #1{%
+ TT\fi
+ \openin\@FileExistsS = #1
+ \ifeof\@FileExistsS
+ \@FileExistsAnswerfalse
+ \else
+ \closein\@FileExistsS
+ \@FileExistsAnswertrue
+ \fi
+ \if@FileExistsAnswer
+}
+\catcode`\@ = 12