Hi Sapna
In the case of SWF outputs, you need to make sure that the
flv file is also copied to the same directory in which the swf is
stored. With exe outputs, the flv is stored "within" the output
file, but with swf output it references to the external flv file
itself.
Try an experiment and in the screen where you reference to
the flv, delete the path and keep only the flv file name, then
publish and make sure your flv is in the same folder. If this
works, then you have a relative link which is obviously more
flexible than the absolute link.
Good Luck