Question About Merged Package Files. [SOLVED]

I'm getting the dreaded material materializing message in game when I try to change wall or floor patterns as well as in CAS.
I think it's due to when I was having problems with the latest game install I had to create a new Sims3 Folder, then add my DC Cache files as well as mods package files back in game.
I have most of my package files  merged. Is there any program where I can Un-Merge a package file to see what is inside so I can get rid of the files in the merged package that I don't want?

Thanks

Sorry for not getting back sooner. Problem has been solved :-)

Sorry I forgot to share.
I couldn't find the original tutorial. The user set it as private?!?!!?
Whatever...lol.
Anyway here is a good tutorial. I had to un merge my merged package files because somewhere there was a merged pattern...and that can give you the materialize error in game.

Here is a link to the other tute I found.
http://nonasims.wordpress.com/2012/03/19/tutorial-how-to-unmerge-a-package-or-multiple-packages/

Since the other person made the video tutorial private for the original tutorial I found I will make a video on how to do it soon. And it will be public.

Problem solved, topic locked.