For those that may encounter this in the future.
In NEMO patcher, be careful with what reads the popup window!
You specify new_file_name.ext (where .ext is your extension, usually .lub or .lua) for:
Iteminfo
Towninfo
Tipbox
PetEvolutionCln
PrivateAirplane
MonsterSizeEffect
CheckAttendance
MapInfo
AchievementList
And you specify new_file_name without extension for:
OngoingQuestInfo
RecommendedQuestInfo