How to make popup windows centered ?

[xpmule]

First off i've looked around and googled and can't find the answer i need..
Also im using ver. 5.6

What i'm trying to do is see if i can make pop up windows centered, atleast the one
you see when you right click an entry and select "Edit Metadata"
problem is it always comes up top left off my screen and its a pain to have
to move the window placement every time i edit tag data
(i move it so i can see the menu text better)

I have been using winamp for over 10 years continously and have advanced pc skills
so if someone has a suggestion for me such as editing an .ini file in the appdata folder
or something i have no problem that.. willing to try anything ? (maybe edit a skin ?)

Uhh i'll add that im using xp pro x64 and my screen res. is nvidia/samsung -> 1080p

Aside from that i have no complaints and winamp works well for a media center for me.
I use Coreavc and ffdshow for most video and audio and built in plugins for flac/mp3
Coreavc's h264 codec produces smoother playback in my experience with mkv's.
I mentioned that to show im capabable of setting up custom configurations in WA
Desperatly wanna find a fix for this window issue / anyone have any ideas ?