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How to open .STPXZ files on Windows

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.

Step-by-step instructions

  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.

Common 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.

Security note

.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.

Back to .STPXZ extension page