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RISC OS Filebase
Home > Filetypes

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Filetypes

RISC OS uses a three-digit hexadecimal number to represent the type of a file. This information is stored with the file attributes and can easily be lost when transfering the to or from another platform. The Filebase maintains a comprehensive database of Filetypes, allowing you to lookup information either by hexadecimal code, or by type name (eg, FFF is the code for the 'Text' file type).

Search by hexadecimal code:

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The latest version of The Unofficial Acorn Filetypes List (from which much of the information here is gathered) is available from http://foldoc.doc.ic.ac.uk/acorn/doc/filetypes.

Filetype (and module) registrations are now handled by RISCOS Ltd , allocate@riscos.com.

!Typeinfo

!Typeinfo by David Sharp intercepts attempts to run files of unknown type and tells you what programs can handle the type.

Downloadable Lists

The full list of filetypes stored on the Filebase is downloadable in the following formats:

Overview

000-0FFPersonal usage (non-distributed)
100-3FFNon-commercial distributed software
400-9FFCommercial Software
A00-AFFAcornsoft and other commercial software
B00-DFFCommercial software
E00-FFFAcorn

The minimum requirement for a valid allocation is that double-clicking the file loads an application and does something meaningful with it. Use existing file formats (not just within the Acorn world), and make data interchange as painless as possible. If your software is going to be distributed, get an allocated filetype to avoid clashes.

Types on the Filebase have one line for each different use of a filetype. Each line has the format:

  • Type - Three hexadecimal digits
  • Code - Status
    • R = This type is registered with the official list (maintained by RISCOS Ltd)
    • D = This type is deprecated - a registered or newer type exists
  • Name - The short name for the type (File$Type_XXX)
  • Description - The kind of data in files of this type
  • Origin - The originator (author or company) of the filetype
  • File Extensions/MIME types - Common filename extensions and MIME content-types used elsewhere


Design & Code Copyright © 2006 ANS. Not associated with Castle Technology, RISCOS Ltd, or any other company
Webmaster: Stephen Courtney. The ANS Filebase is hosted by acornusers.org