The *.mss file extension is related to the Sony CAV-M1000ES receiver. The *.mss file stores memory setup save data.
MSS file extension - Sony CAV-M1000ES memory setup save file
What is mss file? How to open mss files?
File type specification:
The MSS file extension is associated with the Sony CAV-M1000ES receiver.
The *.mss files contain input source, common source, 12V Trigger, 2nd page macros, RS232 command strings and main remote RF ID information.