Where and how are the extra columns available for list view in Finder defined? In an answer to an earlier question I found out that the available columns for Finder's list view are relative to the folder path. This means that one could choose to add a Dimensions column when browsing under ~/Pictures or Artist under ~/Music or Codec under ~/Movies.

Where and how these are defined?

Is there a centralised file that links a path ~/Pictures, column Dimensions and action "get file's dimensions" together?

Or is the column and the action defined in a centralised location and then a folder's property (like "this is a folder for pictures") enables the columns?

Or are these all defined relatively under the folder path? Or something else?

I think I'm indirectly asking whether or not it is possible to customise the columns (add own) and enable them for different locations.
Try renaming the folder to "Pictures" or moving it into a folder named "Pictures" -- that did the trick for me.