I have read so many threads on this subject and am totally confused. The advice i see quite often given to guys having problems with crashes, freezes, whatever is, download a particular version of this file and place it in the FSX root folder and sometimes delete or replace the one in the windows folder etc, etc, etc.I am not having any major problems apart from the odd glitch here and there. For instance controller problems after landing, which could be my fault because as yet i have not installed any Hotfixes. Or maybe it has nothing to do with NGX and more to do with my controller hardware/software and there is the occasional jitter in my graghics when panning around which could be settings in EzDok or Trackir.So, do i leave well alone or am i headed for problems if i don't replace,delete, add or whatever this file?And what i am realy interested in is why some guys need to fiddle with this file and others seem not to. So i am confused.