Board Thread:Questions and Answers/@comment-149.140.3.152-20180412213303/@comment-5395153-20180415113128

You need RLEViewer to extract them as bmp's first. After that, make whatever changes you like and use the Infinite Graphics Compressor to change the bmp back into an rle again (ignoring all warnings. It does actually make the rle file despite this). Both those tools can be found here: http://etheria.wikia.com/wiki/Tool_Downloads