Marathon 2 Aleph One physics file
File type: Game file
A PHYA file is a physics file used by Aleph One for Marathon 2-based scenarios.
It stores gameplay rules and object properties that Aleph One uses while running the game.
File type category:
Game file
Date updated: September 27, 2026
A PHYA file belongs to the open-source Aleph One game engine, which is based on Bungie's Marathon 2 engine and supports the original game and community-made scenarios.
The file contains a scenario's physics model, including gameplay rules and properties for objects. It works with the other data files that make up an Aleph One scenario.
The Aleph One game engine powers dozens of community-made games, from new levels to total conversions.
Install Aleph One for Microsoft Windows and place the PHYA file in the location expected by the associated Marathon 2 scenario. Open or run the scenario in Aleph One; the file is normally loaded as part of the scenario rather than opened as a standalone document.
A PHYA file is not intended to be read in a text editor. Use the Aleph One game engine or a compatible scenario-editing tool to work with its contents.
There is no general-purpose conversion from the PHYA format to a common file format. The file is a game data resource, not a document intended for export.
To change its contents, use an Aleph One-compatible physics or scenario editing tool and save the result in the format required by Aleph One. Keep a backup of the original file before editing it.
Software applications that handle other tasks involving phya files:
Microsoft Windows
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