TODO

Add-ons (PWADs)

The launcher only starts the main games; add-on WADs found in archives are skipped. Order of work:

Pick an add-on in the launcher and load it on top of its game (-file), import PWADs from archives and links, and give each add-on its own saves.
No Rest for the Living (nerve.wad) and the Master Levels (masterlevels.wad) from the 2024 re-release: classic-format DOOM II maps, so they should run once loading works. Check their level order and secret exits.
SIGIL and SIGIL II (sigil.wad, sigil2.wad): the re-release versions are episodes 5 and 6, which need episode, intermission and sky support beyond episode 4.
Legacy of Rust (id1.wad with id1-*.wad and id24res.wad): needs the id24 extensions (new weapons, monsters and the rest of the spec). Largest of these.

Folder links behind a redirect (for example a shorturl.at link to a folder): the listing's relative links are resolved against the typed address, not the address the redirect lands on, so the files cannot be opened. Learn the final address (sceHttpSetRedirectCallback, CURLINFO_EFFECTIVE_URL on the PC) and resolve against it. Short links straight to a file already work.