fgsfdsfgs/perfect_dark answers as perfect-dark-pc-port/perfect_dark. At 32a1cb9f the home path test reads the size lookup correctly, so data beside the executable is the last fallback (port/src/fs.c:96-121).
100 emulator names the two platforms run had no profile, so their packs carried nothing for them. Each was read from the platform's own launcher or scriptmodule: the same program as an existing profile takes the name in cores:, a different build gets its own profile read from that version, a launcher or self-contained game goes to remove_cores, and the rest are new profiles written from their source or shipped binary. The files they need that the collection lacked are collected from the upstream distributions. Bungie and splitwolf trees are read by path and stay out of dedup.
Abdessamad Derraz