Excel List (.exl)
Note
‘Excel’ here has nothing to do with Microsoft’s Excel.
I recommend reading the “Excel List” section on xiv.dev’s Excel docs.
Describes Excel sheets that exist in the game data. A good example is is exd/rool.exl which contains many references to the game data. It’s a text file containing a list of comma-separated strings, where each line is separated by a newline:
EXLT,2
Achievement,209
Action,4
content/DeepDungeon2Achievement,-1
content/DeepDungeon2Gacha,-1
With an Excel List parsed, you can then build a path to a Excel header or .exh. To do so, simply move all characters to lowercase and append .exh at the end:
Achievement,209 -> exh/achievement.exh