The Logic Off Topic list

How can I setup some kind of macro, or batch file that will take 
files(in this, audio files), and if their names end in "____-L.wav", 
or in other words "*-L.wav", take that and change it to "*.wal".

   The "*" can be anything else, and will remain in the name with 
".wal" afterward. I don't want to just change the extension, I also 
want to get rid of the "-L" before the extension.

df