WebP is supported by two possible methods: - If you have installed a WebP codec (such as Google's) then it can be loaded using WIC (automatically) - If you have installed and registered the ImageMagick plug-in then loading and saving to WebP is supported. This method supports the DLL's being located in a sub-folder. The method is changing in next week's release. In 11.4.0 you call RegisterPlugin and pass a folder: