VFAPI Reader Codec and Converter is a small tool developed by the author of TMPGEnc
that allows you to convert and read a kind of pseudo AVI of various file types in applications that normally don't support them (like VirtualDub
VFAPI acts like a regular video compression codec except that it isn't a codec, but more like a wrapper. It gets uncompressed RGB data from the serving application (DVD2AVI, AviUtl or TMPG) and wraps it into an AVI so that the file can be opened in any application which supports the AVI format.
A must have for everybody who wants to use .D2V projects in order to encode VOB files into DivX with VirtualDub.