VS 2008 Reading SGI Files (with .rgb Extension)?

I have to read SGI Files (I belive it's Suns Raster Image files, they have .rgb extension,but contains no header information), scale it, rotate it and maybe apply anti-aliasing filter to resampled image.I am just trying to read the image file. I read the file in byte array using FileStream and trying to display it in a image box, but it is throwing error while creating Bitmap class from the byte array. My code looks like this:

csharp
string imgpath = "Images\sample1_400x400.rgb";
System.IO.FileStream fs = System.IO.File.OpenRead(imgpath);

[code]......