Looking at various guides on the internet like this steam post
it references the install.vdf file, which is, as far as I can tell, a steam-install specific file. If you have the game installed
from a different launcher this file might not exist. And given that there seem no ingame language options available
it seems it usually just chooses the language of the PC's region settings.
But luckily even without the file it seems, the same effect can be achieved by directly editing registry regardless of how you installed the game using these steps:
- Open
regeditwith Windows + R - Manually rightclick-add the keys
\LucasArts\IndianaJones_TOAto the pathComputer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node