When you have selected your system and press 'Display', you do not see all of your games. Some roms are not displayed.

In order for ARRM to display these roms, their file extensions for this system must be known to ARRM.

It is possible to modify the list of these extensions.

Go to the ' Main Options ' tab and click on ' Edit Extensions '

the file ' systemes_extensions.txt ' opens in your default text file editor. You can also find it in %appdata%\nexouille soft\arrm\database\systemes_extensions.txt

It looks like that :

3do|.iso;.bin;.cue;.chd
3ds|.3ds;.3dsx;.elf;.axf;.cci;.cxi;.app
amiga1000|.adf;.uae;.lha;.zip;.ipf;.dms;.adz
amiga1200|.adf;.uae;.lha;.zip;.ipf;.dms;.adz
amiga3000|.adf;.uae;.lha;.zip;.ipf;.dms;.adz
...

Let's say that you want to add a .zip extension for the 3DO system so it will be enough to modify the line of the 3do in this way:

3do|.iso;.bin;.cue;.chd;.zip

Save the file, and restart ARRM.

So when we click on the 3Do system then the 'Display' button, ARRM will search for all files with extensions: .iso .bin .cue .chd and .zip