The .aos file extension is most commonly associated with Nokia mobile phones. The AOS files contain add-on software that can be installed on a user's cell phone. The Nokia PC Suite commonly uses the .aos file extension.
The .aos file extension is also used for Archos signed encrypted data files and Gmini firmware update files.
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If you have additional information about the AOS file format or software that uses files with the AOS suffix, please do get in touch - we would love hearing from you.