ISO 10303-21:2016(E)
Annex K
(informative)
Recommended names for file types
In resolution 583 (Stuttgart, Germany, - June 2003) SC4 recommended
the following type names for files described by this part of ISO 10303
- The type names .stp and .step for files according to the ISO 10303
Application Protocols. .
- The type name .p21 for general use including those described by
ISO 10303, ISO 13584 and ISO 15926.