A follow-up with good success
Okay, here's what I did, I made a backup copy of that "flash" folder and all files in it.
Then, I go into the "flash" folder (not the backup one).
Make two copies of that "test.swf" file, so you'll have like "test.swf", "test2.swf" and "test3.swf" as an example.
Rename all "UI_BG*" files to have a ".OLD" extension, so it looks like this:
UI_BG_01.swf.OLD
UI_BG_single_01.swf.OLD
UI_BG_single_02.swf.OLD
UI_BG_Slideshow02.swf.OLD
Now, rename "test2.swf" to "UI_BG_single_02.swf"
and then rename "test3.swf" to "UI_BG_Slideshow02.swf"
(of course without having the quotes "" in the files names)
Now, when you run TS2013, instead of seeing those 3 quickly repeating loading screens, you'll have that one nice picture of a rail-road yard scene instead. You'll still have the blue-loading bar at the bottom to indicate it's loading/working. Rejoice!
