Notes about the RBMNU file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The RBMNU file type is primarily associated with 'REALbasic' by REAL Software, Inc..
REALbasic is a rapid application development environment that enables developers to create high-quality, native software for Windows, Mac and Linux.
A plain text file.