[Zope] LocalFS and Zcatalog

Hi, I have a bunch of files in a local non-Zope file system that I want to index in Zope with a catalog. I tried to use LocalFS but I can not create a Zcatalog on it. I also had a look at Kaivo Document Library but it doesn't work because Kaivo requires the files to be in Zope. Is there a way to create a catalog on a LocalFS, or should I use another product? Thanks a lot, Remi