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.STPXZ file extension

To open .STPXZ files on Windows, try opening the file with a CAD/3D exchange application that explicitly supports STEP-XML (.stpx) and compressed STEP-XML (.stpxz), such as a STEP/XML reader implementation.

To open a .STPXZ file, use a CAD/3D exchange tool that supports STEP-XML compressed files (STPXZ), such as software built on STEP/XML import capabilities. If it won’t open on mobile, transfer it to a desktop system with STEP-XML support.

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Last updated: June 10, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page
  • Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
  • Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
  • Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
  • Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
  • Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

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

How to open .STPXZ files

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

Windows

  1. Try opening the file with a CAD/3D exchange application that explicitly supports STEP-XML (.stpx) and compressed STEP-XML (.stpxz), such as a STEP/XML reader implementation.
  2. If your software supports import, use File → Open/Import and select the .STPXZ file (do not rename the extension).
  3. If you need to inspect the container, make a copy and open it as a ZIP archive to view contents, then import the contained STEP-XML with a compatible reader.
Full Windows guide

Mac

  1. Use a CAD/translation tool that supports STEP-XML (.stpx) and STPXZ; open/import the .STPXZ from the application’s File → Open/Import function.
  2. If the app fails to recognize the file, confirm it specifically lists STPXZ support (not only classic .stp/.step).
  3. For troubleshooting only, make a copy and inspect it as a ZIP container, then feed the extracted STEP-XML into a STEP/XML-capable importer.
Full Mac guide

Linux

  1. Open/import the file using a STEP/XML-capable exchange tool available in your environment; verify it lists STPXZ (compressed STEP-XML) support.
  2. If the tool does not accept .STPXZ directly, extract the ZIP container and try importing the contained STEP-XML (.stpx / XML) with the same tool.
Full Linux guide

iOS

  1. iOS typically won’t natively preview STEP-XML/STEP data; if your app cannot open it, transfer the .STPXZ to a desktop CAD/translation tool that supports STPXZ.
Full iOS guide

Android

  1. Android usually lacks reliable native STEP-XML/STPXZ support; if a viewer cannot import it, transfer the file to a desktop system with STEP/XML (STPXZ) support.
Full Android guide

Security notes

  • .STPXZ is a compressed container; treat it like a ZIP from an untrusted source—opening it may expose you to decompression bombs or unexpectedly large extracted data.
  • Even though it is “just data,” CAD/3D importers are complex parsers; only open untrusted STPXZ files in software you keep updated and consider using a sandboxed/isolated environment for unknown files.
  • Avoid renaming unknown files to .stpxz to force an importer to parse them; importers may behave unpredictably if the content is not actually STEP-XML compressed.

What can hide inside an archive

Compressed packages can contain executables or scripts you only see after extraction. Double extensions and nested archives are common tricks. Scan unexpected downloads before unpacking, and extract to an empty folder so you can review contents safely.

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Can't open this file?

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

Common reasons

  • The file opens as a ZIP archive instead of a 3D model
  • App supports STEP (.stp/.step) but not STPXZ
  • Import fails or produces incomplete geometry/metadata
  • Mobile apps can’t open or preview the file

Fix steps

  1. Open/import the file from within a STEP/XML-capable CAD exchange application rather than double-clicking it in the file manager.
  2. If needed, extract the archive and then import the contained STEP-XML with software that supports ISO 10303-28 (STEP-XML).

OS-specific troubleshooting

What is a .STPXZ file?

.STPXZ is the compressed form of STEP-XML (ISO 10303-28), i.e., STEP product data encoded as XML and then packaged as a ZIP-based container. The corresponding official media type for the zipped STEP-XML form is model/step-xml+zip. In practice, .stpxz is used where XML-based STEP exchange is preferred and compression is desired for transfer and storage.

Background

STEP-XML (ISO 10303-28) is an implementation method for representing STEP (ISO 10303) data using XML, enabling workflows that benefit from XML tooling and structured data exchange. The .STPXZ extension is widely used to indicate that the STEP-XML content is compressed, commonly using a ZIP container.

In engineering data exchange, .STPXZ files appear in pipelines that move product models between systems or services, especially where “XML-coded STEP” is supported. Some industry guidance explicitly describes *.stpxZ as a compressed Domain Model XML file and documents expectations for the compressed structure.

Because .STPXZ is a compressed container around structured model data, it is not typically meant to be edited manually. It is usually imported into CAD translation/exchange software that can read STEP-XML, or into platforms that explicitly list support for “STEP (XML compressed)” and the model/step-xml+zip media type.

Common MIME types: model/step-xml+zip

Further reading

Authoritative resources for more details on the .STPXZ format.

Common .STPXZ issues

The file opens as a ZIP archive instead of a 3D model

.STPXZ is a compressed STEP-XML container, so some systems treat it like a generic ZIP file rather than a CAD exchange file.

  1. Open/import the file from within a STEP/XML-capable CAD exchange application rather than double-clicking it in the file manager.
  2. If needed, extract the archive and then import the contained STEP-XML with software that supports ISO 10303-28 (STEP-XML).

App supports STEP (.stp/.step) but not STPXZ

Many tools support classic STEP Part 21 files but not STEP-XML (ISO 10303-28) or its compressed .stpxz form.

  1. Check the software’s supported formats list for STEP-XML/STPX and specifically STPXZ (compressed STEP-XML).
  2. Use a translator/exchange tool that explicitly lists STPXZ support (STEP/XML reader capability).

Import fails or produces incomplete geometry/metadata

STEP-XML exchange can be sensitive to schema expectations and to whether the archive matches recommended structure and conventions.

  1. Re-download/re-export the file from the source system to ensure it was generated correctly and fully transferred.
  2. If you can inspect the container, verify it looks like a valid compressed Domain Model XML package (as described in recommended practices) and try importing with another STEP/XML-capable tool.

Mobile apps can’t open or preview the file

Mobile platforms often lack full STEP-XML/STPXZ import support, and viewers may only handle other CAD formats.

  1. Transfer the .STPXZ to Windows/macOS/Linux and open it in a STEP/XML-capable CAD exchange/translation application.
  2. If a mobile app claims STEP support, confirm it supports STEP-XML (STPX/STPXZ), not only .stp/.step.

FAQ

What is the difference between .STPX and .STPXZ?

.STPX is STEP-XML (ISO 10303-28) in XML form, while .STPXZ is the compressed (ZIP-packaged) form of STEP-XML.

Is there an official MIME/media type for .STPXZ?

Yes. The official media type for zipped STEP-XML is model/step-xml+zip (listed in the IANA Media Types registry).

Can I convert .STPXZ by just renaming it to .ZIP or .STPX?

Renaming does not convert the underlying content. Some systems may open it as a ZIP if it is a ZIP container, but proper use is to import it with STEP/XML-capable software (or extract and then import the contained STEP-XML).

Is .STPXZ the same as a regular STEP file (.stp/.step)?

No. Regular STEP files are commonly Part 21 text representations, while .STPXZ is STEP-XML (ISO 10303-28) packaged in compressed form.

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