I thought that zlib was the method used by all standard zip files, I don't know whether that's correct or even helpful though
@MojoMan220 - You can download the ROF files Nauhalauta uploaded to MegaUpload and then use my deROF tool (if you're running Windows) to extract files from them. I don't know how much of it you can use without having other software, but I'm just saying there is SOME stuff already