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You need a program that can export it's models to .b3d, .3ds or .x. You could youse 3DS Max or Milkshape.
No, the .bmp is either a texture or the icon. Icons can be easily made by the render function of 3Ds Max or with externals programs. I suppose that the text files you mentioned are the sys files.Unfortunately I don't have much experience with modeling, but I think some Users from unrealsoftware.de can help you out.