Found a new free fuzzing tool by Microsoft called MiniFuzz. From the site:
MiniFuzz is a very simple fuzzer designed to ease adoption of fuzz testing by non-security people who are unfamiliar with file fuzzing tools or have never used them in their current software development processes.

While it's focused specifically on file-handling, it's relatively easy to get setup and use. I don't use Visual Studio, but apparently, you can also use it as a VS add-on.