Take info from Xref files inside main max file

You work in your main max file and want to apply a function to xref max files (may be in silent mod or somehow else), make some changes there, save them, update the connection to them, and get some info from there inside your main max file. Is there a need to open these files if they are already Xrefed to your scene? I'm afraid about opening in case these files are big!

fn Xref_FN =
(
xref_max_index = xrefs.getXRefFileCount()
for i = 1 to xref_max_index do
(
this_xref = xrefs.getXrefFile i
LoadMaxFile this_xref

print --(some info from there)

max file save
updateXRef this_xref
)
)