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creo4 config.pro option documentation for: INTF_IN_EXTRACT_PROFILES            

intf_in_extract_profiles

none * , comp , all
Controls the conversion of planar composite curves to datum curves for feature creation. This is when you import an IGES, STEP, or CATIA file containing planar composite curves into a Creo part or assembly.
none - Does not extract profile curves during import.
comp - Imports only planar composite curves.
all - Imports all planar curves.