AMOS File

What are AMOS files and how to open them

Are you having problems opening an AMOS 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 AMOS files.

What is an AMOS file?

AMOS files have multiple uses, and AMOS Pro source is one of them. Read more about the other uses further down the page.

AMOS Pro source

These AMOS files contain the code used to design multimedia software on the Amiga computer, a popular home computer in the 1980s and 1990s. AMOS is used to create multimedia software, video games, and educational software. AMOS Pro is the advanced version of AMOS with extra features like better IDE, ARexx support, a new UI API, and flow control constructs.

How to open AMOS files

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

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 18, 2026

All known file formats using extension .AMOS

While AMOS Pro source is a popular type of AMOS-file, we know of 2 different uses of the .AMOS file extension. Different software may use files with the same extension for different types of data.

AMOS Source

AMOS Source files are source-code files written in the AMOS Basic family of programming languages for the Commodore Amiga computer. Such files hold a program in tokenised BASIC code, often saved via the editor in AMOS, Easy AMOS, or AMOS Professional. Users write their code using AMOS's language features - control structures, sprites, sound, etc. - and then save or compile it from the AMOS environment.

These source files are produced by the AMOS editor/compiler tools. They're typically edited within AMOS (or associated editors), then compiled using the AMOS compiler (e.g. using the APCmp command). AMOS Source files are binary files rather than plain ASCII, combining tokenised code with optional "banks" of additional data (sprites, icons, memory banks) that the program might use.

Internally the file begins with a 16-byte ASCII header identifying which AMOS version and mode saved it (for instance "AMOS Pro101V…", or "AMOS Basic V1.3…"), followed by a 4-byte big-endian integer giving the length of the tokenised BASIC code. After the token stream comes the ASCII tag "AmBs", then a 2-byte count of how many memory banks follow, with each bank stored with its type and size. Within the BASIC code, lines have a format starting with a 1-byte line length (in words), 1-byte indent level, then a series of tokens (2 bytes or more each), ending in a null token.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

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