When opening a STEP file in NX using File --> Open, the prefereces set in the NX file is not the expected settings that reside in our standard NX templates.
It is also unclear which STEP protocol is used, AP203, AP214 or AP242, when File --> Open in NX is used for translation.
Solution
When you use File --> Open in NX to translate a STEP file the AP203 STEP to NX translator is used.
The template / seed part used while performing this translation is "step203ugnullnx110_mm.prt", (or "step203ugnullnx110_in.prt" if you use English units), in %UGII_BASE_DIR%\STEP203UG or where ever you directed STEP203UG_DIR variable to point.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: ASSEMBLIES
Version: V1899
Function: PART_FILE_OPS
Ref: 001-8845792