pertaining CW HC08 installation folder there is one tool called decoder.exe. Please take a look at: {Your classic CW installation}\prog\decoder.exe.
We can only be able to decode it and see the object code in assembly-pseudo (not real assembly) format.
Erich blog has nicely documented this related. see:
http://mcuoneclipse.com/2013/04/01/decoding-s19-files/