There are several startup parameters available to start d2tm.exe with.

Usage is:

d2tm.exe -<param> ...

Multiple params can be given at once.

Example usage

d2tm.exe -nosound -windowed

This runs the game, without sounds enabled and in windowed mode.

windowed - run in Windowed mode

nosound - no sounds enabled

nomusic - no music enabled, sound effects remain enabled

game <filename> - run the game with a specific rules file (when not specified it uses game.ini)

noai - disable AI behavior

oneai - only enable one AI

noreinforcements - do not spawn reinforcements during campaign missions

usages - this draws the amount of units, structures, projectiles and particles in use vs available during gameplay

You cannot change the screen resolution (yet) via startup params. Instead use this method.