You could either:

1. Place a shortcut of the batch file in the startup folder
2. you could create a shortcut to a batch file that both explores the specified file and starts the batch file. You could also change the icon of the shortcut to a folder to make it look more realistic.

E.g

@echo off
start INSERT THE BATCH FILE PATH HERE
%SystemRoot%\explorer.exe "FOLDER PATH HERE"

This will:
Start Dbat.bat and
Open up the folder you specified so you can explore it.

It will have the illusion of starting the batch while opening the file but really it will be starting a batch file.