Some Renpy games use ".webp" image files renamed to ".png" so that the file size is reduced, if this is the case with the game you are using 'unren' on then you may need to either:It worked but i can't view the pictures
1. Install a WEBP file codex so your image file viewer can understand the contents of the image file.
2. (if you already have the codex) Use an image file viewer that ignores the file extension, because if the viewer insists on treating the file as a PNG then it will fail to read it's contents.