Picasa - effects of rename outside of Picasa

I reckon that if you change the name of a photo which you had previously edited with Picasa, then the edits which I believe are recorded in Picasa.ini for that folder, are lost, i.e. not applied to the new named photo.

However today I noticed this was not the case. I renamed some files both in Windows File Explorer and in another program (FastStone Image Viewer) and Picasa still recognised the and applied the edits to the newly named photo.

Picasas needs to be open when the files are renamed I believe oherwise it does not reconnect the new name to its original edits.