Had you found a way to extract files from your cooked ROM?
If no there is a way to extract/modify any ROM.Go to
http://aniruddhamukherjee.wikispaces...n+HTC+nbh+file and follow the instuctions. Only thing to change is the compression method used for your device. see this at step 6 : Generate new Imgfs from Dump. e.g. for my device which is Touch HD aka Blackstone the compression format is XPR and
not LZX. Try this method !