I take it you are referring to the soundpool files on the download version of MM16 ?

There should be 4 soundpool files and a "docs" file that come on the download. "execute" each of the files. this will load all the sounds into the "Basic_16" folder in the Magix folder. C:\Documents and Settings\All Users\Documents\MAGIX_Music_Maker_16\Basics_16

 Start the program (assuming you have it installed) and make sure you are not in easy mode (button under the Magix logo top left of screen.)

At the bottom, in the soundpool area there is a button called "add styles" click that and go to the directory C:\Documents and Settings\All Users\Documents\MAGIX_Music_Maker_16\Basics_16 

With that directory chosen as the root directory, click OK and your sounds will be loaded in the soundpool.