You can use S3DSpy to extract individual WAV files from the .pfs EQ files that contain the game sounds. You want "levelup.wav" from snd2.pfs:
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For S3DSpy - you want version 1.3 as apparently 1.2 doesn't work?
https://sourceforge.net/projects/eqe.../S3DSpy%201.3/
It's a public domain sound - hence why you hear it everywhere. I don't see any reason why I can't just attach it to this post.
-Mcoy