Gun (first) support does not work

[willll]

As discussed : https://discordapp.com/channels/573208485689294868/628230581221588993/1278512333030952960

overall issue : first gun (did not test the second one) is not detected properly, neither handled.

Demo used : demogun.zip

How it is behaving with mednafen :
Screencast from 2024-08-29 11-41-53.webm