: Use a tool like NSC_builder to repack the modified files back into an NSP format that can be installed via Goldleaf or Tinfoil on custom firmware.
: This is the official service that allows users to play retro titles via dedicated emulator apps (NES, SNES, N64, Sega Genesis, and Game Boy). SEGA-GENESIS-NINTENDO-SWITCH-ONLINE-NSP-ROMSLAB...
For those keeping their Switch libraries complete, the pack is officially up on Romslab. Highlights: : Use a tool like NSC_builder to repack