EXS 24 Logic Sampler Users Group

I  received my SAM horns the other day and just dropped the 
SAM_HORN,EXE into the sampler instruments folder (as Logic 
suggested I do) but I see nothing of it in the EXS.
I'm on a Mac is there something I need to do to convert this file?
I searched the archive,Emagic web help,and all the read me files 
,but couldn't find this info.
I'm really looking forward to hearing this after all that has been 
discussed here.
Many thanks!
Hayes