This article explains what a MODD file is and how to use one on your computer.
How to open the Mods folder in Minecraft
A file with the MODD file extension is a Sony Video Analytics file, created by some Sony camcorders. They are used by Sony's PlayMemories Home (PMH) program to manage the files after they have been imported to a computer.
MODD files store things like GPS information, time and date, ratings, comments, tags, thumbnails, and other details. They are normally accompanied by MOFF files, THM files, images, and M2TS or MPG videos.
For example, the file might look like filename.m2ts.modd to indicate that it describes details about an M2TS file.