@Meatydeal When creating a PBP file, I know you just provide the BIN file, not a CUE. But it's been a while since I've tried to create my own, and once I discovered CHD files, I no longer needed to.

CHD files are MAME Compressed Hunks of Data files. It's a compression format for disk images that are not only smaller than PBP files, but they're lossless, so they result in better quality files than PBP conversions. When you create a CHD you do it using the CUE file, and it will embed that, and the associated BIN files, into the final CHD file.