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

as4 file icon.as4 - SurfSaver file

as4 file icon.as4 - Alpha Four application custom screen file

Detailed description

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AS4 file extension - IBM AS/400 client access file

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.

Help how to open AS4 files:

Due the variability and uncertainty of this file type group, there is no general information available, about how to open this various data file format. However most files with extension from this group are usually not meant to be opened or viewed directly. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.

For general information try to look at:
Identifying unknown file formats

How to convert file with extension AS4:

Due the variability and uncertainty of this file type group, there is no general information available, about how to convert this various data file format. However most files with extension from this group are usually not in formats, which can be converted. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.

Related links:

AS/400 on Wikipedia

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