No Pat, all of my files are seen, none hidden. For some reason, it seems FSX - Steam Addition puts the main Scenery.cfg in ProgramData>Microsoft>FSX, not in one's User AppData>Roaming. The problem I am having is more of not knowing where to direct the installs. The FSX folder is in Program Files(x86)>Steam>steamsapps>FSX, not Program Files(x86)>Microsoft Games>FSX. And FSXUTUSA had no option as to where to point the uinstall's Scenery.cfg. REX gives one that options. Just a whole new ball game and I don't know how to play with it.
I have FSX:SE. It placed the Scenery.CFG, the one that get's altered when adding/subtracting things to/from FSX's Scenery Library, in C:\Users\All Users\Microsoft\FSX on my system. The "virgin" copy is still in FSX's root folder.
Because of all the troubles with putting anything FSX in C:\Program Files or C:\Program Files(X86), especially in Win10, even with UAC turned off, or way down anyway, I installed it on my PC's D: drive, here: D:\steam\steamapps\common\FSX. I am familiar with installing things into FSX:SE. Plane's, scenery, gauges, effects, whatever.
No, I've never had anything to do with FSXUTUSA. I only can afford freeware. Having said that, I never allow autoinstallers to do their own thing. I ALWAYS point them at an empty TEMP folder of some sort, and cut-n-paste the results over to the correct places in SE myself.
The Scenery.CFG that gets changed is where I showed earlier, not in C:\Users\<YourUserName>\AppData\Roaming\Microsoft\FSX. That's where .cfg files like FSX.CFG, EXE.XML, DLL.XML, and so on, are located. The Scenery.CFG file is in C:\Users\All Users\Microsoft\FSX . At least on MY system.
Having said all that, changing the Scenery.cfg file isn't usually the way to go. Normally, one places the add-on scenery where one wants. Whether you place it in the ...\FSX\Addon Scenery folder, or someplace other is up to you. Then, in the sim's Settings>Scenery Library menu, one selects Add Area, and navigates to where one placed the main scenery folder of the new scenery. Click OK, then, when it opens that folder, showing the scenery's ...\scenery and ...\texture subfolders, just lclick on the white area around them. Do NOT click on OK at this point, just the white area. Then, after the sim automatically takes one back to the Scenery Library menu, click OK to back on out again. The sim will alter the correct Scenery.CFG file, in the correct location.
Just exactly like FSX Boxed.
SE and the Box versions are pretty much the same when it comes to stuff like this. No big secrets about SE, just changed a little, and placed deeper in Steam's folder structure than the Boxed version was, is all. Either use the cut-n-paste method, or manually select the SE location for autoinstallers. A lot have troubles finding SE if they aren't written specifically for SE. BUT, by using the cut-n-paste method, one can obviate this problem.
Have fun!
Pat☺