EXS 24 Logic Sampler Users Group

I DLed a few .wav samples but can't figure out how to convert them to 
exs. Towards the beginning of the EXS chapter in the Plug-in Reference 
manual it clearly states that wav (among other) files are compatible. 
There are procedures for importing various file types but none for wav 
(or aiff).

How should I proceed?

thanks in advance
Andris