: To ensure a game installs in English, the angielski.doi file must be placed in the same folder as the setup.exe before running the installer. Potential Confusion with DOI (Digital Object Identifier)

While the filename contains "doi," it is unrelated to the used in academic publishing.

In the context of game repacks, such as those from , users are often given the option to download only the specific language files they need to save disk space.

: In many Polish academic reports, "j. angielski, DOI: [link]" simply indicates that a publication is in the English language and provides its unique scholarly identifier. Features of the DOI registrar – Crossref

: The .doi file is a proprietary data format that contains the compressed audio, text, and subtitle assets for a specific language (in this case, English/angielski).