STEP

Writable

3d · also known as STEP

ISO 10303 is an ISO standard for the computer-interpretable representation and exchange of product manufacturing information.

Identify it

Extensions	`.step.stp.p21`
MIME types	`application/octet-stream`
Signatures	`49534f2d31303330332d32313b` at byte 0 (Standard for the Exchange of Product model data)
PRONOM	`fmt/698`
Wikidata	`Q3509055`

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PhotoRecOpen sourcereads · GNU General Public License
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3D Utilitiesreads
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Autodesk 3ds Maxreads · proprietary license
Autodesk Inventorreads · proprietary license
EliteCADreads
Form-Zreads
Fusion 360reads
IntelliCADreads
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Keyshotreads
LiteBox3Dreads
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ZygoteBodyreads

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From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.