After seeing that the expo rom url was pulled out of a network trace I decided to do the same with my IQ.
I wasn't able to find a LG_...Ship.exe, in the packets or just by guessing at urls based on expo's filename.
I was however able to find a reference to a .kdz file here
http://csmg.lgmobile.com:9002/swdata/WEBSW/GW825/ATLSTN/v10c_03/V10C_03.kdzThat file is only 177MB, which iirc is considerably smaller than the expo one. I haven't had a chance to do any research, so I have no idea if that's the same format as the aforementioned DZ. :|
Extra mostly useless info:
I got that in a response to a web call when I tried to launch 'phone recovery' from the updater app menu. I had wierd issues with that app, it managed to put the phone into emergency download mode, but then lost the connection, never to regain it.
I was trying this under w7 x32 home premium (as an admin - elevating as my regular user didn't even allow the updater app to see the phone). I guess I'll have to dust off the old XP laptop and try from there when I can find more time.