It does!!!

I just put the following into a textfile (testloadbuf.txt)

This is the first line
and the second
but this is the third
while this is the fourth
followed by the fith
later comes the sixth

as you can see, it is not in alphabetical order.

then, in mIRC, I typed:
/window -ae @Test
In @Test, I typed:
/loadbuf -pr @Test testloadbuf.txt

and it loaded it as:

This is the first line
and the second
but this is the third
while this is the fourth
followed by the fith
later comes the sixth

Can't see what the problem you are having...

mIRC6.03/W2K