How to retrieve contents of Stick Notes directly from file system?

You can open the SNT file in 7ZIP. There'll be one folder for each note, where there's always 3 files: 1, 0 and 3.

The "3" file contains your data.

Rename the local system's StickyNotes.snt file, restore the one you want to look at into C:\Users\<UserName>\AppData\Roaming\Microsoft\Sticky Notes, look at at it in the local system, copy it, etc.

When you're done, copy the version you renamed back over top of the version you restored.

Just run the free program Sticky7List from helpingthings.com. It will automatically open the proper file and will show you all your sticky notes in a list. View, copy and paste to your own text file as needed.