Cheers, Mike.
It seems that it sort of works like that. If I have a series of subfolders and then type 'bass' in the filter - it still shows all the subfolders but the files shown in the subfolders will be filtered to the word 'bass'
This means that I have to go into each subfolder one by one to find the filtered results. If the browser can hide the subfolders with no results, that would make it much more useful. Unless I'm missing something?