If you check
this post you will see that rdl does NOT use quickpar. If you take a closer look at the install dir... there are no dlls either. Whatever he uses to parcheck... its built in. Also the previous poster was saying that the decoding phase is what he thought would benefit.
Though, maybe I'm wrong... the decoding phase doesn't take very long at all. It might help if you are watching x264 on a pc that isn't quite ready. I had that problem when I was on my 4400+ ... it would play 720p but would start slowing down if I had any cpu spikes. I sometimes would pause nl (i used at the time) to prevent it from overpowering the player I was using.
for the winrar comment... I don't know if he's using winrar code... but its again not a dll. IF he was using winrar code, winrar does have 64bit versions
see here. and 7zip has a full 64bit build (gui as well)
here [rant]
I have not switched to x64 due to extremely bad driver support from creative on the xfi... who should die a horrible death. However I will eventually drop another small fortune on a competitors card that actually works as advertized on vista 64. I do believe that the more programs with native 64bit builds the better EVEN THE ONES THAT YOU CANT NOTICE!
You may have noticed that recently a lot of OEMs have been shipping consumer pcs with vista x64 ... that tells you one thing... we're (the world) actually going to see the 64bit shift either this or next upgrade cycle. Microsoft was a bit ahead of the game (been a while since i said that) with xp 64... nobody bit; now they are.
At one time 16 bit applications were the norm, and I remember a lot of resistance to upgrade to 32bit... but my memory is pretty foggy back then. When win 9x was out they supported 16bit applications from w3.1 and dos... does that mean people preferred running them just cause in some cases you couldn't tell the difference? do people still use 16 bit applications today?
Anyway... I'm getting tired of people using the excuse "you wont notice the difference" for the reasoning not to produce 64bit applications. In many cases where this statement is truely correct the difference in compiling the application is a few lines and a few search/replaces. For the applications that WILL see significant benefit however it might be slightly more work... but the compiler flag does most the work in either case.
[/rant]