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How to open .ASICS files on Mac

To open .ASICS files on Mac, macOS does not normally provide built-in ASiC-S signature validation for .ASICS files.

Step-by-step instructions

  1. macOS does not normally provide built-in ASiC-S signature validation for .ASICS files.
  2. Open the file with an ASiC/DigiDoc-compatible desktop application available to you, or use a trusted DSS-compatible validation service supplied by your organization.
  3. If the file only opens as a ZIP archive, do not treat that as signature validation; use a proper ASiC validator.

Alternative methods

  • Open .ASICS in a browser-based viewer if desktop apps fail.
  • Try opening .ASICS on Mac with a secondary app to rule out app-specific issues.
  • Convert .ASICS only with trusted tools when direct opening is not possible.

Common issues

The file opens like a ZIP archive instead of a signed document

ASiC-S containers are ZIP-based, so generic archive tools may list or extract their contents, but they will not validate the electronic signature.

  1. Open the file in ASiC/DigiDoc-compatible validation software.
  2. Check the validation result, signer information, timestamp, and certificate status.
  3. Do not assume the extracted document is trustworthy unless the container validates successfully.

No app is associated with .ASICS

The operating system may not know which program handles ASiC-S containers.

  1. Install or access a trusted ASiC-compatible validator, such as DigiDoc4 Client, e-Szigno, or a DSS-based service used by your organization.
  2. Use Open with to select that application.
  3. If you received the file from a government, bank, or business workflow, ask the sender which validator they expect you to use.

Signature validation fails

The container or its data may have been modified, the download may be incomplete, or the validator may be unable to check certificate or timestamp information.

  1. Download or request the file again without editing or extracting and repackaging it.
  2. Try validation while connected to the internet, because certificate and revocation checks may require online access.
  3. Ask the sender for a fresh container if the validator reports that the data or signature has been altered.

Renaming to .zip or extracting changes the workflow

Although the format is ZIP-based, changing the extension or repackaging the contents can break the expected ASiC structure or invalidate checks.

  1. Keep the original .ASICS file unchanged for validation and archiving.
  2. If you need the contained document, export or extract it from a trusted ASiC application after validation.
  3. Do not create a new .ASICS file by manually zipping files unless your signing software specifically supports that workflow.

Security note

A valid ASiC signature can prove integrity and signer information, but it does not guarantee that the signed document itself is harmless; the contained data object can be any file type.

Back to .ASICS extension page