How to open a file in a program in bat?

Question

cmd/bat

Look, you need to open the video file in the program, like when you drag the file onto the program, only in bat, how to do it?

Answer 1

But in the bat file it will come to prescribe the path to the video files and this will never be convenient.
Here is a small example

@echo off
set file=file.rrt
set program=notepad.exe
start "" "%program%" "%file%"

To assign a format to a file, use assoc .

Answer 2

usually in the program there is an option to launch from the console ...
something like - /path to the program.exe/ -file.mp4