Full Idea
There is a hierarchy of files. Proto-files are the most basic; conceptual files are generated from them. First-order ones are more basic, as the higher-order encylopedic entries presuppose them.
Gist of Idea
Files are hierarchical: proto-files, then first-order, then higher-order encyclopedic
Source
François Recanati (Mental Files [2012], 6.3)
Book Reference
Recanati,François: 'Mental Files' [OUP 2012], p.75
A Reaction
This hierarchy might fit into a decent account of categories, if a plausible one could be found. A good prospect for exploring categories would be to start with mental file-types, and work outwards through their relations.