ASLX File

What are ASLX files and how to open them

Are you having problems opening an ASLX file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your ASLX files.

What is an ASLX file?

An .ASLX file is a Quest Adventure Script file.

Quest Adventure Script files store the complete source of a text adventure game created using the Quest software (version 5), which is used for crafting interactive fiction and gamebooks. They serve both as the editable form of a game and as a format for libraries that define game logic, vocabulary, object types, built-in commands and behaviours. These files let authors define rooms, objects, player actions, scripts and functions in a structured way so that Quest can run, edit and publish the game.

The format is XML-based. Each file begins with a root element <asl> whose version attribute indicates which Quest game version the file is for (for example version 500, 550, 580, etc.). Within that, game content is arranged in elements like include for libraries, game, object, exit, command, function, turnscript, and walkthrough. Objects may inherit behaviour from other named objects, have nested objects inside them, and carry various attributes (look, take, prefix, etc.), where attributes may be typed (string, script, integer, dictionaries).

Quest writes these files. They are edited either through Quest's GUI (including a "code view") or by manually editing the XML. When publishing a game, Quest compiles everything (including libraries) into a .quest file but the editable .aslx is the master source. Libraries (like Core.aslx, English.aslx) are included by reference so multiple games can reuse shared logic. Authors may build custom libraries as well.

Identification of these files includes that they are XML documents beginning with <asl> and contain key quoted strings such as INHERIT NAME, ASL VERSION, OBJECT NAME, GAME NAME, PLAYER. The root element is asl, and mandatory elements/functions include a player object, and functions like HandleCommand, ScopeInventory, GetPlacesObjectsList and ScopeExits.

How to open ASLX files

Important: Different programs may use files with the ASLX file extension for different purposes, so unless you are sure which format your ASLX file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single ASLX opener which you will find listed below.

Last updated: August 21, 2026

Various apps that use files with this extension

These apps are known to open certain types of ASLX files. Remember, different programs may use ASLX files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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