You can't really decompile VB6 - there is something called VBRezQ that extracts the code structure - but you're not really going to have any luck getting the source code from the Exe.
http://www.vbrezq.com/ >Dear Experts
>
>I have lost source codes of one of my Visual Basic Exe's.
>Is there any Tool like Refox to get source files from VB6 Exe.
>
>Please help
ICQ 10556 (ya), 254117