Simple getBytesTotal Question :D

Hi all,
I have a preloader with a dynamic text field displaying the total movie size indicated from the following code:

_root.totalK = Math.round(getBytesTotal()/1024) +" K";

The result is 334 K. Cool, right?

Curious though, when I turn on the bandwidth profiler, the file size is said to be 170 K.

When I view the file in the finder window, it reads as 180 K.

I am assuming there is something missing from my code.

Any ideas?

Thank You.