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:
.obj),Render(.slp),VRML(.wrl),ACIS File(.sat),
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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