bibtex+file export, path construction?

A couple of questions. If I export bibtex and files, in the .bib file a path to a pdf may look like this:

file = {91WR00267.pdf:files/135/91WR00267.pdf:application/pdf}

How is the '/135/' component of the above path generated?

If I add/remove/muck about with my collection, and then re-export, will the paths to existing items be unchanged?
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