bigroo,
It IS just as straightforward as MadMango describes it. However, if the file has gaps in it or other problems you may not have such an easy time, i.e., crap in equals crap out.
A few comments/questions:
1. Whomever is creating the file in STEP format can probably save it out directly as IGES.
2. What is the purpose for the IGES file? It is not really a preferred format for solids.
- - -Updraft