Continuing on this issue, I tried some ROMs by doing what is described in [1]:
Load Core -> Download Core... -> mupen64plus_libretro.so.zip Load Core -> mupen64plus_libretro.so Online Updater -> Core Updater -> mupen64plus_libretro.so.zip Load Content -> /path/to/Z64/files And I can at least see the Z64 files. I wonder if in Caleb Herbert's case they are somewhat naed with a leading dot (".example.z64" or ".z64"), in which case RetroArch will hide these unless you do the following: Load Content -> Settings -> Show Hidden Files and Folders = ON I hope this helps. ;) [1] <https://lists.gnu.org/archive/html/help-guix/2017-07/msg00043.html>. -- - https://libreplanet.org/wiki/User:Adfeno - Palestrante e consultor sobre /software/ livre (não confundir com gratis). - "WhatsApp"? Ele não é livre. Por favor, veja formas de se comunicar instantaneamente comigo no endereço abaixo. - Contato: https://libreplanet.org/wiki/User:Adfeno#vCard - Arquivos comuns aceitos (apenas sem DRM): Corel Draw, Microsoft Office, MP3, MP4, WMA, WMV. - Arquivos comuns aceitos e enviados: CSV, GNU Dia, GNU Emacs Org, GNU GIMP, Inkscape SVG, JPG, LibreOffice (padrão ODF), OGG, OPUS, PDF (apenas sem DRM), PNG, TXT, WEBM.