Sorry it's been about a decade since I decompiled VB6 so I can't remember the tools I used. This one
http://www.vb-decompiler.org/ might do a better job if it's designed specifically for VB.
Here is another one:
http://www.soft32.com/download_124248.htmlI used this search term:
http://www.google.com/search?q=vb6+decompiler