Windows Update vs. Downloaded fixes

Hi all!
Somebody knows why some sizes of patches in Windows
Update are smaller than when I download them?

For example, the KB839645 fix have 3905KB while that
Windows Update indicates only 677KB. Why? This fix is for
Windows XP SP1 English version. I don't understat. =(

Hi,

You may be seeing this discrepance because most of the updates on Windows
Update use a version of delta patching. Which will only download the files
that have changed and are different than the files that are currently on
your machine. Where the size of the update in the KB or on Download Center
is the size for the full version of the update.

Thank you

Eric
"Paolo" <> wrote in message
news:5cc301c4814a$76c48490$...
> Hi all!
> Somebody knows why some sizes of patches in Windows
> Update are smaller than when I download them?
>
> For example, the KB839645 fix have 3905KB while that
> Windows Update indicates only 677KB. Why? This fix is for
> Windows XP SP1 English version. I don't understat. =(