An r36 file extension is related to the Recomposer MIDI Sequencer music file format.
There is one other file type using
the R36 file extension!
.r36 - Split Multi-volume RAR compressed file archive (part 38)
R36 file extension - Recomposer MIDI Sequencer music
What is r36 file? How to open r36 files?
File type specification:
The r36 file is sort of MIDI sequence format.
This format is produced from some sequencers released from Come-On Music's products, Recomposer series ( These are only famous in Japan).
Since these format is very popular in Japan, many MIDI sequence data based on these format instead of Standard MIDI file (SMF) are existing. There are even some free software sequencers those are capable handle these format.