I also was wondering (and still wonder!) as to why this entry is included into the WPS context menu. If I want to open a certain file with a certain plugin, I point to that file in the file browser and select "Open with...". There the option is Ok. But the sequence is: first, I think of a file and then about what I'd like to do with it. In the WPS, the situation is different. You are presented the file (the playing one) and then you choose the plugin. BTW: I bet only few plugins can do something with an audio file, so the entry is effectively useless.
Why should be there because of spliteditor? Can't you run that plugin on the file from the file browser?
So I'd be for excluding this entry from the wps context menu.