[racket] the program can't find image file

hello.
there is a problem when I make an executable file

source is located at c:\
and run.bmp is located at c:\
so in c:\ there are
c:\traffic.rkt
c:\run.bmp

and
in the source file there is a line such as
(define hero (bitmap "run.bmp"))

and I make as an executable file

and execute it.
so far so good. it works well

but when I delete the c:\run.bmp
then the image does not apear in the program

I notice from the other people who received my program
they complain of absence of images
because the program can't find the images from c:\

is it bug or my mistake?

if it is my mistake, would you please let me know what I have to do?
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