WonderEnd 0 and Lunime's other games are made with Adobe Air, a framework. The absolute gold standard for ripping assets from Adobe Flash/AIR games is a free, open-source tool called JPEXS Free Flash Decompiler (often just called FFDEC). Download FFDEC at https://github.com/jindrapetrik/jpexs-decompiler/releases/tag/version26.2.1.