So first thing, your games have a .bin and .cue files, not .bin and .iso, that wouldn't make sense.
When you're in that case, just select the .cue file (the small one) and it should work properly. If not, check the contents of the .cue file and how the .bin file is referenced (cue files are basic text files). The filename has to respect capitalization.
If you've tried everything and it still doesn't work, also give the .bin file a try.