Where is export_descr_buildings.txt file in M2?

[Garnier]

Its in the data folder, if you've unpacked your game.

[sapi]

Place the following text into a bat file (using notepad; save as .bat), save the file to your unpacker folder, and run:

unpacker.exe --source=..\..\packs\*.pack --destination=..\..\ --verbosity=1 --filter *descr*.txt

That'll unpack the most commonly modified files to your data folder, and shouldnt' take up too much space.

Once you've added what you want, make a bat file in the main medieval2 folder with the following:

medieval2.exe --io.file_first