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.AZS file extension

To open .AZS files on Windows, install AirZip FileSECURE Reader if it is available to you from a trusted source or your organization.

To open a .AZS file, use AirZip FileSECURE Reader, the application identified by AirZip and the IANA media-type registration for this format. Do not rename the file to .zip or another extension; .AZS is a protected FileSECURE format.

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Last updated: April 29, 2026 · Reviewed by Julian Stricker

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .AZS files

Use these platform-specific instructions to open .AZS files safely.

Windows

  1. Install AirZip FileSECURE Reader if it is available to you from a trusted source or your organization.
  2. Double-click the .AZS file, or right-click it and choose Open with, then select AirZip FileSECURE Reader.
  3. If the file requires credentials, permissions, or a key, obtain them from the sender or the organization that created the file.
Full Windows guide

Mac

  1. No native macOS application support is documented in the provided sources.
  2. Ask the sender for an unprotected copy or a format you can open on macOS, or transfer the file to a Windows system with AirZip FileSECURE Reader.
  3. Do not try to open it with a ZIP utility unless you only want to confirm that it is not a standard archive.
Full Mac guide

Linux

  1. No native Linux application support is documented in the provided sources.
  2. Use a Windows system with AirZip FileSECURE Reader, or ask the sender to provide the content in another format.
  3. If you need to verify the file type, check that the source is trusted and that the file was not renamed from another extension.
Full Linux guide

iOS

  1. No iOS app support is documented in the provided sources; ask the sender for a readable format or open the file on a Windows desktop with AirZip FileSECURE Reader.
Full iOS guide

Android

  1. No Android app support is documented in the provided sources; transfer the file to a Windows computer with AirZip FileSECURE Reader or request another format from the sender.
Full Android guide

Security notes

  • .AZS is a protected container that can secure many kinds of files, so only open files from senders you trust and expect.
  • Use AirZip FileSECURE Reader or software supplied by your organization; avoid unofficial converters or password-removal tools.
  • Do not try to bypass FileSECURE permissions. If you cannot open the file, request proper access or an alternative copy from the owner.
  • If the protected content is exported or otherwise made available as a native file, treat that resulting file according to its actual type, especially if it is an executable, script, or macro-enabled document.

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Can't open this file?

These are the most common causes and fixes when .AZS files fail to open.

Common reasons

  • The .AZS file opens in the wrong program
  • The file cannot be opened on Mac, Linux, iPhone, or Android
  • Access is denied or the file asks for authorization
  • The file may be incomplete or mislabeled

Fix steps

  1. Right-click the file and choose Open with.
  2. Select AirZip FileSECURE Reader if it is installed.
  3. If Reader is not installed, obtain it from a trusted source or your organization rather than trying random archive utilities.

OS-specific troubleshooting

What is a .AZS file?

An .AZS file is an AirZip FileSECURE file used to secure files for storage or transfer. AirZip documentation describes .AZS as the default format opened by FileSECURE Reader, and IANA registers its MIME type as application/vnd.airzip.filesecure.azs with binary encoding and magic number 0xD3415A53. It is best understood as a protected secure container rather than a general-purpose archive format.

Background

In practical terms, you usually receive an .AZS file when someone has protected a document or other file with AirZip FileSECURE. The Reader guide states that FileSECURE files with .AZS or .AZF extensions can only be opened with FileSECURE Reader, so general archive tools such as ZIP utilities should not be expected to extract them.

Common MIME types: application/vnd.airzip.filesecure.azs

Further reading

Authoritative resources for more details on the .AZS format.

Common .AZS issues

The .AZS file opens in the wrong program

Windows may associate the extension with a generic archive tool or another application, but .AZS is a FileSECURE format.

  1. Right-click the file and choose Open with.
  2. Select AirZip FileSECURE Reader if it is installed.
  3. If Reader is not installed, obtain it from a trusted source or your organization rather than trying random archive utilities.

The file cannot be opened on Mac, Linux, iPhone, or Android

The available sources identify AirZip FileSECURE Reader as the intended application and list Windows support through file-extension references; cross-platform support is not documented.

  1. Open the file on a Windows system that has AirZip FileSECURE Reader.
  2. Ask the sender to export or resend the content in a standard format you can open.
  3. Do not assume the file is corrupted just because mobile or Unix-like systems cannot preview it.

Access is denied or the file asks for authorization

.AZS files are protected FileSECURE files, so opening them may depend on permissions, credentials, or policies set by the creator.

  1. Confirm that you are the intended recipient.
  2. Contact the sender or administrator for the required access information.
  3. Avoid using unofficial tools that claim to bypass FileSECURE protection.

The file may be incomplete or mislabeled

A failed download, email attachment problem, or manual renaming can leave you with a file that looks like .AZS but is not a valid FileSECURE file.

  1. Re-download the file or ask the sender to resend it.
  2. Check the file size against the sender's original copy.
  3. If your tools can inspect file signatures, a valid registered .AZS file is associated with the magic number 0xD3415A53.

FAQ

Is an .AZS file the same as a ZIP archive?

No. Although it is sometimes described as an archive or secure container, .AZS is an AirZip FileSECURE format and is not meant to be opened with ordinary ZIP tools.

What program opens .AZS files?

AirZip FileSECURE Reader is the intended application identified in AirZip documentation and the IANA media-type registration.

Can I open an .AZS file on macOS, Linux, iOS, or Android?

The provided sources do not document native support for those platforms. The practical option is to use a Windows system with AirZip FileSECURE Reader or ask the sender for another format.

What is the MIME type for .AZS?

The registered MIME type is application/vnd.airzip.filesecure.azs.

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