Might as well close the source if you aren't going to use it.

Plugins/CoreAudio/CoreAudioDecoder.m

@@ -46,6 +46,8 @@
 	NSURL *url = [source url];
 	if (![[url scheme] isEqualToString:@"file"])
 		return NO;
+		
+	[source close]; //There's no room for your kind around here!
 	
 	// Open the input file
 	err = FSPathMakeRef((const UInt8 *)[[url path] UTF8String], &ref, NULL);