An as file extension is related to the AppleSingle file format. It is old and obsolete format.

There are 2 other file types using
the AS file extension!

empty - Applix spreadsheet

as - Adobe Flash ActionScript document

Detailed description

Software that open as file

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AS file extension - AppleSingle encoded data

What is as file? How to open as files?

File type specification:

Various data file type icon Various data file type

as file icon: as filetype icon

Typically, these are given the extension .dat and the MIME-type in the E-mail system is set to properly identify them; however, .as extension is sometimes used. Probably used on older Apple computers and Apple OS.

AppleSingle is file format developed by Apple Computer in order to store Mac OS "dual-forked" files on the Unix filesystem being used in A/UX, Apple's first Unix-like operating system. AppleSingle combined both file forks and the related Finder meta-file information into a single file. Support for the format was later added to Unix software such as NFS and MAE, but they saw little use outside this small market.

Mime types:

This as file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

The default software associated to open as file:

macOS icon

Apple, Inc. logomacOS  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

macOS is Unix-based desktop operating system, a successor of Mac OS X system for MacBook-family, iMac, Mac Mini and Mac Pro computers, developed and sold by Apple, Inc.

Mac OS X icon

Apple, Inc. logoMac OS X  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

OS X or Mac OS X is Unix-based operating system developed by Apple Inc. for Macintosh computers. It contains basic core applications for everyday use, such as Finder basic file manager, Safari for Internet browsing, QuickTime for video, iTunes for managing audio data and iPod, iOS devices management , iMessage instant messaging, Mail, Contacts, Calendar and many more.

The latest version 10.11 of OS X is called El Capitan. It is available to purchase on Mac App Store as well as is distributed with new Mac computers and notebooks. It includes features to improve the security, performance, design and usability.

OS X operating system was replaced by new macOS in 2016!

Help how to open:

Use compatible tools to work with *.as files.

How to convert:

As far as we know, this .as file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of recommended software applications associated to the .as file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open as file, edit as file, convert as file, view as file, play as file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with as file - AppleSingle encoded data

Click on the software link for more information about macOS. macOS uses as file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Apple macOS / Mac OS X:

Main software associated with as file by default:
macOS small icon macOS
Mac OS X small icon Mac OS X

Previous file extension
ARV file extension > Various data file types

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file extension AS2


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