What I’m trying to do is have all my FDS games run via nestopia core. Rather than change each game to use it, is there a way to specify a core to use in the run command for a given file extension?
<system>
<name>fds</name>
<fullname>Famicom Disk System</fullname>
<path>~/RetroPie/roms/fds</path>
<extension>.FDS .zip .ZIP .fds</extension>
<command>/opt/retropie/supplementary/runcommand/runcommand.sh 0 _SYS_ nes %ROM%</command>
<platform>fds</platform>
<theme>fds</theme>
</system>
where ‘nes’ would be something like fds or something.