Files with as4 file extension are kindred with AS/400 by an older generation of mid-range computer systems for IBM. They are made to store client access data.

There are 2 other file types using
the AS4 file extension!

empty icon.as4 - SurfSaver data

empty icon.as4 - Alpha Four application custom screen file

Detailed description

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AS4 file extension - IBM AS/400 client access data

What is as4 file? How to open as4 files?

File type specification:

Various data file type icon Various data file type

The as4 file extension is mainly related to AS/400 by an older generation of mid-range computer systems for IBM.

The platform was first introduced as AS/400 in 1987 and later renamed as the eServer iSeries in 2000. As part of IBM's Systems branding initiative in 2006, it was again renamed to System i.

These as4 files were used for store client access data.

This as4 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.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .as4 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.

Related links:

AS/400 on Wikipedia

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