From Just Solve the File Format Problem
RMC is a mostly unknown filetype. It most likely contains graphics data for the PC program Pokemon Project Studio (Red version and Blue version).
A companion file of extension GRC may be required, and may hold vital information.
RMC files are able to be interpreted by the Pokemon Project Studio EXE file, but can not be directly read from by the end-user.
- PRQSL0409.rmc: file from PPS Red
- PBQSL0409.rmc: file from PPS Blue
- PBRQSL0409.rmc: file from both PPS Red and Blue (identical)