Libretro: Read .GDI Folders

Hello,
I’ve decided to add this suggestion since multiple .CDIs can be picked from the game list when in the Flycast folder.
This however is currently impossible for .GDIs since they require additional files to be read (track01.bin, track02.raw files).
I’m currently hot swapping the games files in order to play different titles in game for .GDI files.

Just replying with the documentation for multiple-disc games since someone else was asking about it, no idea if it helps or not:

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Thank you for the documentation.

After running a few tests and learning how to index files with m3u file extension, I was unable to get them working.
The games show up in the game list but selecting them just leads to the emulation not running.
Perhaps I’m doing something wrong.
I’ve used my backup of Sonic Adventure as an example below:

#EXTM3U

#EXTINF:-1,Sonic Adventure - Sonic Team
D:\SteamLibrary\steamapps\common\Tower Unite\Tower\Libretro\Roms\Flycast\Sonic Adventure (Disk 1).gdi
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