The fallback encoder is used when the file cannot be saved in its original format. For example, the Windows Meta File (.wmf) image format has a decoder to read the image, but no encoder to write a new image. In this case, the image cannot be saved in its original format. Specify the format the fallback encoder will use: PNG, JPEG, TIFF, BMP, GIF, or WMPhoto settings.This is not a file type conversion tool, but only works as a fallback for unsupported file formats.