There is only one file type that uses the .P21 extension:
Express STEP Data Model File
3D model format used for three-dimensional product data representation and exchange; saved in an ACSII text format specified by ISO 10303-21; used primarily for industrial automation systems and integration purposes.
NOTE: Express AIM (Application Integrated Model) and MIM (Modular Integrated Model) files must use the .STP extension.
|LKSoft JSDAI for Eclipse|
Updated: June 1, 2008