how to load files saved as following formats into OpenGL application--Need help!

how to import(load) “objects” into an OpenGL application that are saved in the following file format:
IGES(.igs),Neutral(.neu),STEP(.stp),STL(.stl),Inventor(.iv),
WaveFront(
.obj),Render(.slp),VRML(.wrl),ACIS File(.sat),
Assembly(
.asm).
Could you give me some examples or source codes ,or give me some clue about that?I need them in a hurry.Thank you very much! Please help me!

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