Full Idea
Files function metarepresentationally if they serve to represent how other subjects think about objects in the world. ..An 'indexed' file has an index referring to the other subject whose files the indexed file stands for or simulates.
Gist of Idea
An 'indexed' file marks a file which simulates the mental file of some other person
Source
François Recanati (Mental Files [2012], 14.1)
Book Reference
Recanati,François: 'Mental Files' [OUP 2012], p.183
A Reaction
Presumably there is an implicit index on all files, which says in a conversation whether my interlocutor does or does not hold the same file-type as me. Recanati wants many 'types' of files, but I suspect there is just one file type.
Related Idea
Idea 16369 There is a single file per object, memorised, reactivated, consolidated and expanded [Papineau, by Recanati]