Convering .vghd files to .mp4 format.
To our knowledge, there is no way to convert VGHD to MP4 (VirtuaGirlHD Model Videoclips to MPEG-4 Videos). The VirtuaGirlHD software uses exclusively VGHD files, which means they are proprietary and most likely encrypted.
We are not aware of any video editing software or (online) conversion tool capable of converting VGHD to MP4.
In a word, direct vghd to mp4 conversion is not possible.
So don't expect any so-called vghd to mp4 converter or vghd to mp4 free online conversion tool available.