It will show you in the Midi ST Picker window and the Demos folder.

EDIT: I think you should have M_****.STY M_****.stx in Styles folder
and .ST2 like RSynt012.ST2, RPno0210.ST2 etc.. in Soloist folder.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Mac_MST.jpg (125.4 KB, 48 downloads)
MAC_MST_Demos.jpg (78.32 KB, 42 downloads)