In order to report a false positive of Malwarebytes Anti-Ransomware please follow these steps:
Note: these steps have been updated to reflect new steps for Beta 9 -- please ensure you're running the latest beta version 0.9.18.797-1.1.86 before reporting a false positive.
Finish the detection process and reboot if asked by Anti-Ransomware.
After reboot disable the Anti-Ransomware protection.
Restore the file from Quarantine and add it to the exclusions.