The VM & P Naphtha you found, is most probably a very light hydrocarbon.
http://www.allprocorp.com/msds/Klean/VMPWEB.cfm
It was commonly used as lighter fluid in the classic "Zippo" type lighters. It a very light distillate that is lighter than kerosene and about the same as mineral spirits. Not soluable in water so not very useful as a mix in WI.
What part of the country/world do you live in? Some of these names are only used in certain areas.
If your in the U.S. Look for the CAS number on MSDS sheet, if it is methanol it will have a CAS# 67561
All vendors in the U.S. should be able to show you an MSDS (Material Safety Data Sheet) for any "hazardous material" they sell. It's required by law that it be available on request. Many simply have a note book of the sheets you can look at. Each MSDS will have a CAS number on it that uniquely identifies the major chemicals.
http://encyclopedia.thefreedictionary.com/CAS%20number
Larry