Diffs don't contain contents for binary files, so most tooling is unable to do anything with them other than state that a file is binary.
We're evaluating ways to go provide more information, including contents, of binary files in diffs for display, but given the lack of binary support in diffs, we have to come up with our own solution to this.
If you're not even seeing an entry for binary files, then something is likely excluding them from the diff building. I'd need to know what type of repository you're working with. For most, we call out to the repository command line tool's diff builder to generate these.
Also worth mentioning, RBTools 0.7.5 is 7 years old, and much has changed since then. If in doubt, try upgrading that.
Christian