The latest version of SmartCheck is 6.20 and it works with windows xp

You can also try VB Parser 1.2 to get the p-code tokens.

Need more information on cracking vbapps head over to
hxxp://decompiler.theautomaters.com
The best place to find information on vb decompiling.

Some VB msvbvm60.dll api calls for working with files.
__vbaFileOpen,Open #
__vbaGet4,Get #
__vbaInputFile,Input #
__vbaFileClose,Close #
rtcFileSeek,Seek()
rtcFileLocation,Loc()