reverse engineering exe code

A friend (and yes he exists) has asked me what I know about reverse engineering a exe file that was written in VB.

The question is:  How can it be done and what tips?

TIA
jdsmallAsked:
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VbmasterCommented:
What version of VB is it? If it's 4.0 or below it's possible to get the code I think, but with VB5 (and VB6?) you can only get the 'design information' like how forms and controls look like but no code.
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kamallCommented:
There are no decompilers for VB5 and VB6.
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plasmatekCommented:
You can take VB programs down to their raw ASM code with a disassembler, such a W32Dasm. However it will be mostly lots of calls to the VB dll. The is also a decompiler called 'DoDi's Decompiler' which works for VB 2 and 3 - although all your variable names will be changed. If you are trying to recover source code from a vb4/5/6 executable it cannot be done, however if you are trying to change some functions, it can be done fairly easily with a hex editor, a disassembler and a debugger.

Debugger - Softice
Disassembler - W32Dasm
Hex Editor - HIEW or Ultra Edit
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