Opening A Specific File With A Batch File?

Question

I'm would like to know how I can open a specific file using a specific program with a batch file. So far, my batch file can open the program, but I'm not sure how to open a file with that program.

@echo off
start wgnuplot.exe

Answer 1

start wgnplot.exe "c:\path to file to open\foo.dat"

Answer 2

If the file that you want to open is in the same folder as your batch(.bat) file then you can simply try:

start filename.filetype

example: start image.png