Hi, welcome to the Code::Blocks forums!
I'm sorry but currently CB is not able to open shared libraries, not without a specific plugin at least, but I don't think anyone created it. And actually it makes sense since an IDE is not supposed to open object/binary files.
You can open binary files with an Hex editor. If you look for the .so format specification, I guess (not sure) it uses the ELF format.
Regards, XayC