1) Create a blank text document on your desktop and name it "blank.wav".
2) Import it with Import Manager and give it the custom path "Sound\Interface\Warning\Human\KnightInventoryFull1.wav".
Repeat this step for the following:
- "Sound\Interface\Warning\Orc\GruntInventoryFull1.wav"
- "Sound\Interface\Warning\Naga\NagaInventoryFull1.wav"
- "Sound\Interface\Warning\Undead\NecromancerInventoryFull1.wav"
- "Sound\Interface\Warning\NightElf\SentinelInventoryFull1.wav"
3) In map view, go to Advanced > Game interface... look for "Text - Message - 'Inventory is full.'" and put in a single space as its value.
4) Give yourself a firm yet gentle pat on the back.