So I'm trying to get my head around multiple configuration files. Here's what I want to do. I want a default configuration file and then I want a secondary configuration file for specific games that overrides the settings in the default configuration. So maybe by default I want to use standard scaling but on the odd game I want to use TV2X, for instance. I've tried creating a secondary configuration file with just the settings I want to override but I can't get it to work. Here's what I've done...

As a test I wanted a game to automatically go into fullscreen. In my default configuration file I have "fullscreen=false". Reading the documentation I thought I could create a second configuration file, add the line "fullscreen=true" then start DOSBox like this:-

DOSBox.exe -conf "dosbox-0.74-RallyChamp.conf"

and override the settings in the default configuration file, but this doesn't work. DOSBox says in its status window that it is "loading primary settings from config file dosbox-0.74-RallyChamp.conf" so it is definitely finding the file, but it refuses to put the game into full screen or override any settings that are present in my standard dosbox-0.74.conf file. If I copy the whole dosbox-0.74.conf file, rename it, make the changes then call it it works fine, but it would be much more convenient to have an override file.

Is what I'm trying to do possible and if so what am I doing wrong? Thanks.