学步园

  

                bool xx=false;  //default sFileName is not Exe or Dll File 

                System.IO.FileStream  fs=new System.IO.FileStream(sFileName,System.IO.FileMode.Open,System.IO.FileAccess.Read); 

                System.IO.BinaryReader r=new System.IO.BinaryReader(fs); 

                string bx=""; 

                byte buffer; 

                try 

                { 

                    buffer=r.ReadByte(); 

                    bx=buffer.ToString(); 

                    buffer=r.ReadByte(); 

                    bx+=buffer.ToString(); 

 

                } 

                catch (Exception exc) 

                { 

                    Console.WriteLine(exc.Message); 

                } 

                r.Close(); 

                fs.Close(); 

                if (bx=="7790"||bx=="8297"||bx=="8075")//7790:exe,8297:rar,8075:pk 

                { 

                    xx=true; 

                } 

                Console.WriteLine(bx); 

                return xx; 
                dll:MZ 
                exe:MZ 
                rar:Rar 
                zip:PK