MOI is a computer file format used primarily to represent information. MOI files are associated with MOD or TOD files whose content they represent. They are mainly used on JVC camcorders.

MOI file is a JVC/Panasonic HDD Camcorder Timestamp Data. Two files are created for each video clip: MOD/TOD file (which consists of Video- MPEG2-PS and Audio- Dolby Digital AC-3) and MOI file (data information like date and time and video clip aspect ratio 4:3 or 16:9).

If you want to play and convert videos captured by cameras, just get MOD/TOD from cameras to Mac.

Here are some tutorials:
1. How to play MOD and convert MOD on Mac?
2. How to play TOD files on Mac?
3. Convert TOD to MP4, AVI, MOV, etc. on Mac?