there are many crazy things... :
1. when i let windows 7 ultimate 64 bit "detect&install" its windows drivers, then even in control panel-hardware sound-sound-Asus Default Set Speakers-Configure Speaker Test no matter 5.1 or 7.1-all speakers plugged in the Asus Sound Card give Sound
But video files with 5.1 sound only come out of the speakers in "Front jack".
2. Original drivers are only install-able when going to Device Manager-Sound, Video, Game Controller-right click Asus Xonar D2X Audio Device-left click Update driver software
because when i try to install the original driver by "Double Clicking" the setup.exe file, the installation starts and then says "Please plug-in Asus Xonar Sound Card", no matter older or newer drivers. and as i said the Asus Audio Center, which i see responsible for the sound only coming out of the Front jack, is not configureable, because it wasnt installed with the latest original driver by installing it through Device Manager-Update driver software.
btw: i took a look, at what windows actually installs, when i let it installs automatic by detection of new SoundCard on start up...its the exact same latetst original driver, that i install. so, unneccasary to interrupt windows.