VFAPI converted file problem

[bugeyes]

I'm trying to open an AVI converted D2V file with
VirtualDub, VirtualDubMod and NanDub and I get these
programs always blocked.
I used DVD2AVI v 1.86 (GKnot) to get the D2V file
from a VOB and VFAPIConv v 1.05 to convert it to AVI.

TMPGEnc can open both D2V file and AVI converted D2V file.
Graphedit can render an play the AVI converted.
GSpot can render the AVI converted file too, but tells that the
VFAPI reader codec 1.05 is misconfigured and on the
Video Details I see "Unknown VFW Driver file missing"

Can someone help me?
Do I need some plugin to the DUB programs?

Thanks.

System: Athlon 1.8, W98, GForce MX-200

[Krismen]

GSpot can render the AVI converted file too, but tells that the
VFAPI reader codec 1.05 is misconfigured and on the
Video Details I see "Unknown VFW Driver file missing"
Right-click on "vifp.inf" and choose Install.