# ASiC-E Archive Viewer: what a ZIP tool shows and what it misses

> Since an `.asice` file is a ZIP archive, 7-Zip or WinRAR will open it. So why use an ASiC-E archive viewer at all? Because an archive tool sees files, and a signed container is about meaning.

Source: https://asiceviewer.com/en/blog/asice-archive-viewer/
Published: 2026-11-10 · Digixy

## In short

- A ZIP tool lists entries; a signature-aware viewer interprets them.
- Only the latter shows signers, times and integrity.
- Never save changes to a container from a ZIP tool.

## The same container in two tools

| What you see | 7-Zip, WinRAR, Finder | ASiC-E archive viewer |
| Document names and sizes | Yes | Yes |
| `mimetype`, `META-INF` entries | Yes, mixed with documents | Yes, grouped as technical files |
| Who signed | No, only `signatures0.xml` as raw XML | Name, code, time per signer |
| Whether a file was altered | No | Yes, digest comparison |
| Document preview | Opens an external program | Built in |
| Risk of breaking the container | Yes, if you edit or add files | None, read-only |

## Why archive rules matter here

An ASiC container follows stricter rules than a casual ZIP:

- `mimetype` should be the first entry and stored without compression;
- signatures live under `META-INF` with fixed name patterns;
- every signed file is referenced by name, so renaming an entry breaks the link.

Archive tools know none of this. Drag a file into the archive window, confirm "update archive", and the tool rewrites the ZIP in its own order. The documents may be unchanged, yet strict validators can reject the result, and any touched document invalidates the signatures.

## When a ZIP tool is the right choice

- Inspecting a container that a viewer cannot parse because it is damaged.
- Bulk extraction in scripts.
- Checking compression details or entry order while debugging software that produces containers.

For everything else, a signature-aware viewer is quicker and safer.

## Large and unusual archives

[ASiCE Viewer](https://asiceviewer.com/en/#tool) reads the archive directory first and unpacks a file only when you open it, so a container with a hundred attachments lists instantly. Nested archives are handled too: a ZIP or another container inside opens as its own view, with a breadcrumb to step back.

## Plain ZIP files work as well

Drop an ordinary `.zip` onto the viewer and it behaves as a general archive viewer: file list, previews, downloads. If the ZIP turns out to contain `META-INF/signatures*.xml`, it is recognised as a signed container regardless of its extension. This is how renamed e-mail attachments are caught.

## Summary

Use the archive tool when you care about the archive, and the [viewer](https://asiceviewer.com/en/#tool) when you care about the signature. On Android, the [ASiC-E Viewer app](https://play.google.com/store/apps/details?id=com.digixy.asiceviewer&hl=en&referrer=utm_source%3Dasiceviewer.com%26utm_medium%3Dblog-md) plays the same role. Manual extraction is compared in [extract files from ASiC-E](https://asiceviewer.com/en/blog/extract-files-from-asice/).

## Frequently asked questions

**Will opening an .asice file in 7-Zip damage it?**

Opening and extracting is harmless. Adding, deleting or editing entries and saving the archive can break the container.

**Why does my ZIP program show strange file names?**

Some tools assume an old code page for names. A viewer that decodes UTF-8 shows them correctly.

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Open your .asice file now: https://asiceviewer.com/en/
ASiC-E Viewer on Google Play: https://play.google.com/store/apps/details?id=com.digixy.asiceviewer