Local swf File LOCKED after loading!

I have 2 swf files… the main.swf loads the secondary.swf

main.swf is and will run on my local computer in the standalone flash player.

When main.swf loads secondary.swf all is well except secondary.swf is locked on my local file system, I cannot rename, delete, or overwrite it as long as main.swf is running.

I would like main.swf to load secondary.swf and then close the file, seems simple!! however I have had no luck in succeeding…

I am using the standard methods for loading URLRequest and Loader.

Any ideas!? Thanks!