dx9_30.dll is a required file to run Everquest Titanium and is supplied with directx 9.0c as well as other installs. For some reason it was removed by Microsoft in directx 10 (and 11 iirc). Without this file you will eventually end up at a blank screen before hitting the world.
Like I said before, you may of already had this file installed through a different program rather than directx 9 (because it's no longer installed natively in modern Microsoft OS).
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