Ok I messed around and reinstalled everything so everything is default and my scenarios save in the openrct2 scenarios folder in documents, when I save a new scenario, I have to "use system dialog window" to save them though. And yes they are saved as .sc6. When I save them in the default spot, and in game select the scenario to be under the "other parks" tab they are not there.
I have the scenarios, and cannot open them. I have tried changing them to sv6 with no success.