private void attachFidDb() {
		File dbFile = askFile("Attach existing FidDb file", "Attach");
		if (dbFile != null) {
			fidFileManager.addUserFidFile(dbFile);
		}
	}
Method to attach an already-created (but heretofore unknown) database.
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/plugin/FidPlugin.java