The field layout of a Vision file is NOT encoded in the file, so there is no way for vutil to extract that info. It can only report the layout of the key fields and the overall record size. It sounds like you don't have source code for the programs that created these files, so you're trying to reverse-engineer the structure of the data. If you don't own this application (and its source code), perhaps you should try to contact whoever does own it to get this information.
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