Click the Windows "Start" button and type "cmd" without quotes in the Search text box. Press "Enter" to open the Windows command prompt. Type "sqlite" without quotes to start the command line prompt.

Sticky Notes is a Windows app, and unlike other applications like Notepad, it doesn’t store text in a simple TXT file. Instead, it stores all the data in a database named plum.sqlite.

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.