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.ATF file extension

To open .ATF files on Windows, install or open an ASAM ODS-capable application, such as NI DIAdem or the engineering/data-management software that produced the file.

To open a .ATF file, use an ASAM ODS-compatible tool such as NI DIAdem or another vendor tool that supports ASAM Transport Format. If you only need to inspect the contents, a text editor may show the structure, but it will not provide the database-style hierarchy or import features of an ODS tool.

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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 .ATF files

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

Windows

  1. Install or open an ASAM ODS-capable application, such as NI DIAdem or the engineering/data-management software that produced the file.
  2. In the application, use its Open, Import, or ASAM ODS import function and select the .ATF file.
  3. If Windows asks for an app, choose the installed ODS tool rather than renaming the file.
  4. For a quick inspection only, open a copy in a plain-text editor to confirm that it is an ASAM Transport Format text file.
Full Windows guide

Mac

  1. macOS does not include a native .ATF viewer for ASAM ODS files.
  2. Use an ASAM ODS-compatible tool available in your workflow, a vendor converter, or transfer the file to a Windows workstation with an ODS tool such as NI DIAdem.
  3. For inspection only, Control-click the file, choose Open With, and use a plain-text editor; this will not fully interpret the test-data hierarchy.
Full Mac guide

Linux

  1. Linux does not usually have a built-in .ATF opener.
  2. Use an ASAM ODS import/conversion tool from your organization or an ODS-related product listed by ASAM, if available.
  3. To identify the file, open a copy in a text editor or run a text-viewing command; do not edit the original unless you understand the ATF structure.
Full Linux guide

iOS

  1. iOS does not have common native support for ASAM ODS .ATF files; transfer the file to a desktop system with an ODS-capable tool.
  2. A text viewer may display the raw text for inspection, but it will not provide a proper ATF import or data browser.
Full iOS guide

Android

  1. Android does not have common native support for ASAM ODS .ATF files; transfer the file to a desktop system with compatible engineering software.
  2. Use a plain-text viewer only to inspect a copy of the file, not as a substitute for an ODS importer.
Full Android guide

Security notes

  • .ATF is a text-based exchange format, not an executable format, but malformed files can still expose weaknesses in importers or parsers; keep engineering tools updated.
  • Import untrusted .ATF files into a test project or sandboxed workspace before adding them to a production ODS database or measurement archive.
  • Do not manually edit an .ATF file unless you understand the ASAM ODS structure, because small text changes can corrupt the metadata or make imported results misleading.
  • Be cautious with files that claim to be .ATF but are not readable as text or do not match the expected ASAM ODS workflow; confirm the source and file type before opening.

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Can't open this file?

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

Common reasons

  • The .ATF file opens as plain text but the data is hard to understand
  • The software says the file is not supported
  • Import fails or the hierarchy looks wrong
  • The file is very slow to open

Fix steps

  1. Open or import the file with an ASAM ODS-capable application.
  2. Ask the sender which tool and ASAM ODS version or ATF variant was used.
  3. Use the software's hierarchy or data-browser view instead of editing the raw text.

OS-specific troubleshooting

What is a .ATF file?

.ATF is registered by IANA as application/ATF and is associated with ASAM ODS Part 5 ATF/CLA. In ASAM ODS, ATF means ASAM Transport Format, a text-based file description format for exchanging test data and metadata between ODS tools. ASAM ODS also refers to ATF/CLA and ATF/XML variants, so compatibility can depend on the exact variant and ODS version used by the software.

Background

ASAM ODS is a standard for storage, retrieval, and exchange of test data. The .ATF format is used in that ecosystem to move measurement data and related metadata between tools, operating systems, and hardware platforms.

Common MIME types: application/ATF

Further reading

Authoritative resources for more details on the .ATF format.

Common .ATF issues

The .ATF file opens as plain text but the data is hard to understand

ATF is text-based, but it is structured for ASAM ODS tools rather than for manual reading.

  1. Open or import the file with an ASAM ODS-capable application.
  2. Ask the sender which tool and ASAM ODS version or ATF variant was used.
  3. Use the software's hierarchy or data-browser view instead of editing the raw text.

The software says the file is not supported

Not every program supports every ASAM ODS version or ATF variant, such as ATF/CLA versus ATF/XML workflows.

  1. Confirm that the file is an ASAM Transport Format file and not another unrelated format that also uses the .atf extension.
  2. Try an ODS tool known to support Classic or XML ASAM ODS Transport Format files.
  3. If possible, ask the sender to export again using a variant supported by your tool.

Import fails or the hierarchy looks wrong

ASAM ODS files contain data and metadata that must match the expectations of the receiving ODS application or database model.

  1. Use the import options recommended by the software vendor or the organization that supplied the file.
  2. Check whether the file came from a specific test system, measurement platform, or ODS environment.
  3. Import into a test workspace first, then verify the measurements and metadata before using the data in production.

The file is very slow to open

ATF can contain substantial test data and metadata, and text-based exchange files may be large.

  1. Copy the file to a local drive before importing it.
  2. Use a dedicated ODS tool rather than a general text editor for large files.
  3. If the file was downloaded or transferred, verify that the transfer completed successfully.

FAQ

What program opens .ATF files?

Use software that supports ASAM ODS ASAM Transport Format. NI documentation states that DIAdem can interface with Classic and XML ASAM ODS Transport Format files, and other ODS-related vendor tools may also import or convert ATF files.

Can I open an .ATF file in a text editor?

Yes, for inspection, because ASAM Transport Format is text-based. However, a text editor will not interpret the ODS hierarchy, measurement data, or metadata the way an ODS-compatible tool can.

Is .ATF the same as .ATFX?

They are related within ASAM ODS workflows, but they are not necessarily interchangeable. ASAM documentation refers to ATF and ATFX file formats and to ATF/CLA and ATF/XML variants, so use software that supports the specific variant you have.

Can I convert a file by renaming it to .ATF?

No. Renaming only changes the filename extension. Use an export or conversion function in an ASAM ODS-compatible tool.

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