Okay, so I found this here:
QuickTime in a 64-bit Environment
As of writing of this article there is no QuickTime 64-bit support for any Windows system available. In order to bypass this shortcoming, our 64-bit video engine uses a 32-bit helper/wrapper application to access QuickTime. This allows us to offer the same feature set on Windows Vista 64-bit and Windows 7 64-bit. The only exception is the video play-out in Nuendo 64-bit and Cubase 64-bit using e.g. Blackmagic Decklink / Intensity or AJA video cards. This is not possible and requires a 32-bit installation!
So apparently there is a wrapper to help with this issue, do you have any idea how to access it?
I tried downloading that K-Lite 64 bit codec pack but it didn’t do anything to help me out.