I expect it will impossible to support VB6 applications post Windows 7. (I expect the VB6 runtime and IDE to work on windows 7, but not windows 8)
Update: 2/17/12
Microsoft's Visual Basic 6.0 support statement now includes Windows 8. They imply the IDE can be run on Windows 8 as well.
http://msdn.microsoft.com/nb-no/vbrun/ms788708(en-us).aspx