We have a cross platform code which deals with png files, however CodeSign & compression is performed (official way) all the png files in the bundle are retouched and have CgBl header.

I have read the article Iphone PNG images, Wiki/index.php - ModMyi - Wiki

however the solution is not suitable for us because we cannot go through and rewrite anything inside of the bundle (also many files to rewrite).

Does anyone knows if there is a way to modify libpng to simply ignore this header and make it work?