So I tried some modding following Stonewall's thread of how to make changes the right way.
Step 14 is.
14. Start the game. As soon as the load-screen appear press 'F9' once. In the upper right corner 'Edit mode ON' will appear.
Do nothing. The main menu will appear for a short while then your new scenario will load automatically. If you did something wrong (or I explained something wrong) an error message will appear. But normally your scenario should just load.
Nothing seems to happen for me. I get the start up screen, hit f9, get the Edit mode on, then I have the main menu forever. Nothing loads.
Any quick suggestions. I attached my modified database file that I ended up using that csvSplitter thing on.