In short though, columns are more easily identified just by running the tool mentioned in the blog, as that will produce an accurate list of numerical id's (for your system) by name and number directly, rather than counting anything manually.
I do not know for a fact, but I would surmise that the number postfixed to the CLSID would identify a specific item in a subset provided by that particular shell extension (assuming the extension provides more than 1). But that's a guess.
Start with the normal generated list (above) when experimenting, as that's more straightforward to play with.
nikos says: a clisid represents a bunch or properties, individual items need a numeric index like :4
