Sorry, don't quite get you...
You have a VB5 program and want to convert it to VB6, or you want to hack your copy of VB5 and turn it into VB6? If the former, you should be able to use the same source, unless it's particularly complex; most VB5 functions and key words are also in VB6. I started off learning VB6 from a VB4 tutorial. If you wish to perform the latter, I can't help you, and nor can anyone here, as it's impossible and illegal.
Crystalinity