If a library corrupts, can previously analysed files recognise old analysis?

Hi I was playing with RB7 and switching back to RB6 which was working fine but one day it corrupted my library, and told me to re import an older library ie RB5 to convert.

So I did this but a load of tracks that I know have been analysed now showing not. I used traktor years ago and it would always recognise if a track was already anaysed if moved based of the stripes etc, but RB doesnt seem to do this and wants to re analyse most of the content again. I there a way do avoid this and re point the analysis folder even if a library xml corrupted?  Ive got a big libarry which took ages to anayse initally over a perioud of weeks months and years

Thanks