Created attachment 350231 [details] [review]
Add PC Engine ROM MIME type for TurboGrafxCD core

Although the BIOS file is where it should be, GNOME Games cannot use it and says that TurboGrafx-CD platform is not supported.

I got it to work by adding MIME type of the syscard3.pce file (application/x-pc-engine-rom) to libretro descriptor file like this:

[Platform:TurboGrafxCD]
MimeType=application/x-cue;application/x-pc-engine-rom;
Firmwares=SuperSystemCard3;

Both TurboGrafxCD and TurboGrafx16 games work fine for me with like this.