.DAF file extension

To open .DAF files on Windows, identify whether the file came from a Rocket Mobius environment (archive/content management) and ask the sender which Mobius product/workflow produced it (DAF is proprietary).

To open a .DAF file, use Rocket Mobius software (commonly Mobius View) or ask the sender which Mobius workflow/system produced it. Avoid renaming the extension—DAF is a proprietary archive/document format and usually won’t open correctly in generic apps.

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Last updated: April 30, 2026 · Reviewed by Julian Stricker

Open on your device

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

How to open .DAF files

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

Windows

Identify whether the file came from a Rocket Mobius environment (archive/content management) and ask the sender which Mobius product/workflow produced it (DAF is proprietary).
If your organization provides Rocket Mobius software (for example, Mobius View), install/use the approved Mobius client/viewer and open the file from within that workflow.
If you cannot access Mobius software, request the content in a standard export format (for example PDF) from the archive owner/admin rather than trying random “DAF viewers.”

Full Windows guide

Mac

Confirm the .DAF file is a Rocket Mobius Document Archive File (DAF) from your organization’s Mobius system.
Use the Mobius access method your organization provides (for example, Mobius View via an approved deployment) to view the archived content.
If you do not have Mobius access on macOS, ask the sender/admin to export the document to a common format (such as PDF) for viewing.

Full Mac guide

Linux

Check whether the file is intended to be handled by Rocket Mobius (DAF is a Mobius proprietary archive format).
If your organization provides a Mobius web/app workflow, access the content through that approved workflow rather than opening the raw DAF directly.
If you only received a standalone .DAF with no Mobius tooling, request an exported copy (for example PDF) from the source system.

Full Linux guide

iOS

iOS typically will not open proprietary Mobius DAF files directly; use your organization’s approved Mobius access method (often via a managed workflow) or request an exported format like PDF.

Full iOS guide

Android

Android typically will not open proprietary Mobius DAF files directly; use your organization’s approved Mobius access method (often via a managed workflow) or request an exported format like PDF.

Full Android guide

Security notes

DAF is a proprietary enterprise archive format; only open it using your organization’s approved Rocket Mobius software/workflow. Avoid installing unknown third-party “DAF viewers,” as they may be untrustworthy or mishandle proprietary content.
Treat unexpected DAF files as potentially sensitive: archive formats used in content management often contain business records. Confirm the sender and handling requirements before uploading/sharing the file.
If you administer systems that process DAF, enforce correct content-type handling (application/vnd.Mobius.DAF) and restrict where such files can be uploaded/served to reduce the risk of content-type confusion or unintended exposure.

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Can't open this file?

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

Common reasons

The .DAF file won’t open in common apps
Wrong program opens it (or you’re prompted to choose an app)
A system or web app treats the file as the wrong content type

Fix steps

Verify with the sender that it is a Rocket Mobius DAF and ask which Mobius product/workflow should be used to access it (for example via Mobius View).
If you do not have Mobius software/access, request the document be exported from Mobius to a standard format (such as PDF) instead of trying to open the raw DAF.

OS-specific troubleshooting

What is a .DAF file?

.DAF is a proprietary “Document Archive File” format referenced by Rocket Mobius licensing terms and documentation. It is associated with Mobius content management/archiving, and the IANA-registered vendor media type for it is application/vnd.Mobius.DAF. In practice, DAF files are typically handled inside Mobius environments rather than as a broadly supported standalone document type.

Background

DAF is identified in Rocket Mobius materials as the “Document Archive File (DAF)” format and is part of Rocket’s Mobius content management ecosystem. This makes it different from common consumer file formats (like PDF) because it is designed for managed archival and controlled viewing/serving within a Mobius deployment.

From a content-type perspective, DAF has an official vendor MIME type registration: application/vnd.Mobius.DAF (also commonly written in lowercase as application/vnd.mobius.daf in extension-to-MIME reference tables). In web or enterprise deployments, Mobius systems may use MIME-type mappings to decide how content is delivered or handled, and Mobius View documentation describes configuring MIME-type mappings (for example, in web application configuration).

Because the format is proprietary and tied to specific enterprise software, most “How do I open it?” scenarios come down to: (1) open it with the Mobius tooling your organization uses, or (2) obtain an exported/converted version from the system owner (for example, a PDF export) if your device doesn’t have access to Mobius software.

Common MIME types: application/vnd.Mobius.DAF

Common .DAF issues

The .DAF file won’t open in common apps

DAF is a proprietary Rocket Mobius Document Archive File format and usually is not supported by general-purpose document viewers.

Verify with the sender that it is a Rocket Mobius DAF and ask which Mobius product/workflow should be used to access it (for example via Mobius View).
If you do not have Mobius software/access, request the document be exported from Mobius to a standard format (such as PDF) instead of trying to open the raw DAF.

Wrong program opens it (or you’re prompted to choose an app)

Your OS may not have an association for application/vnd.Mobius.DAF, so it prompts for an app or chooses an unrelated one.

Don’t rename the file; instead, use “Open with” and select your organization’s approved Mobius application/workflow (if available).
If you manage a desktop environment, ensure the correct MIME association is configured for application/vnd.Mobius.DAF / application/vnd.mobius.daf (your OS uses MIME/extension mappings).

A system or web app treats the file as the wrong content type

If MIME-type mappings are misconfigured, a Mobius-related web workflow may not recognize or deliver DAF content correctly.

Confirm the server/application is using the correct vendor media type (application/vnd.Mobius.DAF).
Review and correct the MIME-type mappings configuration used by your Mobius deployment (Mobius View documentation discusses MIME-type mappings configuration).

FAQ

What does .DAF mean here?

In the sources provided, .DAF refers to Rocket Mobius “Document Archive File (DAF),” a proprietary format used in Mobius content management/archive workflows.

What is the MIME type for .DAF?

IANA lists the vendor media type as application/vnd.Mobius.DAF (often also written as application/vnd.mobius.daf in reference tables).

Can I convert a .DAF by renaming it to .PDF or another extension?

No. Renaming only changes the filename. If you need a PDF or another standard format, request an export/conversion from the Mobius system/workflow that produced the DAF.

Why can’t my phone open a .DAF file?

DAF is a proprietary Mobius archive format and typically requires Mobius-provided access or workflow. If you don’t have that on mobile, ask for an exported version (for example PDF).

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