Here's what the first two scenarios showed up as in the Utilities Tool:

Where are they? There titles show up as ??? and one of those ??? entries contained the files of two separate scenarios!
Even stranger, here's the text of one of those scenarios' ScenraioProperties.XML file:
4978026406745067975 8266035899561072542 688dd1c7-80a4-4515-9ed7-f6f5dadbb672 Hart-felt Switching Part 1 ba595ab4-8aea-40d6-aa3d-215b6a093ee5 You've been called in for some urgent switching in the Hartford Yards. Check your clipboard (F1) for work orders, c7fe19b0-1cc1-43ac-b41d-762e400eb55f Most switches will be preset for you, but it's your responsibility to check anyway. 681776ca-8c2b-40f2-95b9-108d434b3821 Hartford Engine Shed 1 f816738b-c784-48db-9b03-4902253f39a4 eStandardScenarioClass 28800 35 9 7 1944 SEASON_AUTUMN Kuju RailSimulatorCore Weather\SL_Foggy.xml 3 LOCO_CLASS_DIESEL 0 0 5908 Freight North 45964568-9927-460b-bbd2-120f87834056 EMD GP9 0b64868c-4670-40fc-bca1-c823fd846bee VNHRR Springfield RailVehicles\Diesel\EMD GP9\Engine\NYC2\GP9_NYC2_main.xml (S) Siding6 ee37d8bd-ab93-42f1-9144-3dd0e854ef73 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\EMD GP9\Engine\NYC2 -72.6277 41.7788 17.1474 0 1278 Freight 8deb7c8e-881f-403a-9db3-01ce881cf9c0 EMD GP9 a168ac34-0045-4c8b-89fb-14a3d43ccfd6 VNHRR Springfield RailVehicles\Diesel\EMD GP9\Engine\NH2\GP9_NH1_main.xml Hartford Union Station Track 4 68dc8b98-cb57-438f-8ceb-604624580d27 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\EMD GP9\Engine\NH2 -72.6824 41.7671 17.1474 0 Hartford & south b2b10aa2-7748-4ec0-97f3-05b3d9d5fee3 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 39cf8b8a-5c51-4537-a8ec-1bc934eea6d3 VNHRR Springfield RailVehicles\Diesel\ALCo FA1\Engine2\FA-1_NH.xml Wilson Station 1 3ff00f86-26fe-4103-b413-4b475d4c4630 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\ALCo FA1\Engine2 -72.6532 41.8084 17.1474 0 1500 Springfield passenger c07bd7e3-1bfb-476d-b9a2-b70c66ab4535 ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH ALCO FA-1_NH 0e45e387-dd30-4b28-bc09-9824aadc242b VNHRR Springfield RailVehicles\Diesel\ALCo FA1\Engine\FA-1_NH.xml Hartford Union Station Track 2 157b8563-e4d5-48d4-a34f-fd8ac81085e8 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\ALCo FA1\Engine -72.6819 41.7681 17.1474 0 2705 Freight West 7fade979-230e-4218-8529-55342c7576e8 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 ALCO FA-1_NH2 b485362e-5590-41ff-b662-28e971dfb369 VNHRR Springfield RailVehicles\Diesel\ALCo FA1\Engine3\FA-1_NH.xml b97454c9-0b28-4032-94e1-cf84cafcd382 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\ALCo FA1\Engine3 -72.6301 41.7796 17.1474 0 Coalman b98ace0f-543e-4e3d-a5a5-7e06018b5d4d EMD GP9 22e272ee-5f83-4072-9390-9762e3bf530e VNHRR Springfield RailVehicles\Diesel\EMD GP9\Engine\NH2\GP9_NH1_main.xml CPL Coal Pile In 88502fbc-70b4-43f6-a32a-816301cc8873 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\EMD GP9\Engine\NH2 -72.6522 41.747 14.4719 0 Hart-felt Switcher 2454a707-31e3-444a-a163-95818f2fa28f EMD GP9 af6703cd-87fa-452a-a8a2-1314da332341 VNHRR Springfield RailVehicles\Diesel\EMD GP9\Engine\NH2\GP9_NH1_main.xml Hartford Engine Shed 1 adf777e6-2a56-4509-b875-5e1faedfe4c5 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\EMD GP9\Engine\NH2 -72.6713 41.7782 17.1474 1 Sw 1719 e574b90a-32c4-4a4f-afd3-e7f41732b8d3 EMD GP9 1b738e77-151f-4702-bb29-086fcae03136 VNHRR Springfield RailVehicles\Diesel\EMD GP9\Engine\BM1\GP9_BM1_main.xml Hartford Engine Shed 3 94cac7f7-f093-44bc-8543-4a586eec7db4 LOCO_CLASS_DIESEL VNHRR VNHRR\Springfield\RailVehicles\Diesel\EMD GP9\Engine\BM1 -72.6712 41.778 17.1474 0 VNHRR Springfield 10 0 1 98 7 56 1.0000000 1.0000000 1.0000000 0.0000000 18.4877 -0.0717485 0.0000000 0.9974228 0.0000000 0.0000000 1.0000000 0.0000000 0.0000000 -0.9974228 0.0000000 -0.0717485 0.0000000 -6 658.276 -36 277.61 1 Kuju RailSimulatorCore Editor\Gizmo\Scenario Markers\Standard Scenario Marker.xml Standard Scenario Marker 5195926923765916294 7146871507289971609 09f4a286-a402-481b-991b-6127c5c92e63 0 en 1 Tom Pallen V1 5232228060778233569 17668017689798729375 22847ee1-9bb3-489c-9f5e-c5cd7a6831f5
This is a far cry from the appearance of a normal ScenarioProperties.XML file and I'm hoping that someone with knowledge of such files can help me understand what has gone wrong and how fixing it might be possible.