Before you rush to download a pre-made steam_appid.txt from a random forum, understand the risks:
Understanding the steam_appid.txt for Borderlands 2 steam_appid.txt file is a configuration file used by the Steam-appid.txt Download Borderlands 2
: It is a known step for getting Borderlands 2 to run properly on systems using or when testing builds during development. How to Create the File Before you rush to download a pre-made steam_appid
Steam will scan your folder, notice the missing text file, and redownload it instantly. 2. Create the File Manually notice the missing text file