[the klang]

hello people!
i have just put the software for my a1000 on my pc and cant work out how to put mp4 files on the phone.i put a mpg file on and the phone gets it but wont play it. ok mpg and mp4 are not the same so is there a software that changes mpg to mp4 so the phone can deal with it?
one other thing ,what is a PICSELL VIEWER? when i put a file on the phone it always gos to the picsell viewer,but theres no mention of it in the booklet that comes with the phone.
any help would be great.