XnView uses an SQLite database for storing this info and accessing it; Windows uses a flat file for the image metadata and another for the actual image thumbnails.

An SQLite SMS File iPhone Backup. Apple's iTunes multimedia management software provides a variety of backup options when syncing your iPhone. Alongside its configurable backup options, iTunes ...

I've got it in a sub-folder, and the data source has a hard-coded path to the db file. How can I make it relative? For a WebApp, I'd rely on Server.MapPath, but how to do something similar here?