なぜ文字化けしたか

=1B$B:#D+!"7HBS$+$iEj9F$7$?5-;v$OJ8;z2=3D$1$7$?!#=1B(B
=1B$B$7$+$7!":#;n$7$KAw$C$F$_$?5-;v$O2=3D$1$J$+$C$?!#=1B(B

=1B$B$$$C$?$$$J$<J8;z2=3D$1$7$?$N$@$m$&$+!#=1B(B
=1B$B$J$K$+2=3D$1$5$;$kJ8;zNs$,$"$C$?$N$@$m$&$+!#=1B(B
=1B$B>/$J$/$H$b!"$A$s$3$@$N$^$s$3$@$N$H$O=3Dq$$$F$$$J$$$7!"%+%l!<$+$i$&$s$3$=
,N`?d$5$l$k$+$iJ8;z2=3D$1$5$;$?$H$$$&$o$1$G$O$J$$$i$7$$!#=1B(B
(=1B$B%F%9%H5-;v$O!V$&$s$3!W$H$7$+=3Dq$$$F$$$J$$$N$KJ8;z2=3D$1$7$F$$$J$$$+$i=
=1B(B)

=1B$B$3$3$G!"@h$N%F%9%HEj9F$G$&$s$3$N;0J8;z$7$+=3Dq$$$F$$$J$$$N$O!" a$/;W$$$D$$$?C18l$r=3Dq$$$?$@$1$J$N$G$O$J$/!"%+%l!<$,$&$s$3$rO"A[$5$;$kITE,@=
Z8l6g$K;XDj$5$l$F$$$J$$$3$H$N3NG'$N$?$a$G$"$k!#=1B(B
=1B$B$&$s$3$,=1B(BOK=1B$B$J$i!"%+%l!<$b=1B(BOK=1B$B$N$O$:$@!#=1B(B

=1B$B860x$OITL@$@$,!"$;$C$+$/$J$N$G2=3D$1$?$^$^$K$7$F$*$3$&$H;W$&!#=1B(B=