My suspicion is that the Xbox Game Pass version of the game saves games differently from both the steam version and the version that can be purchased from the Xbox games storefront. (I have not confirmed this, just assuming). It may indeed be that if you buy the game outright, it creates the Grounded Windows 10 folder in the savegames folder. the current Xbox Games Pass version creates a bunch of weirdly named folders inside the WindowsApps folder and also under User\AppData\Local\Packages\Microsoft.Maine_8wekyb3d8bbwe\SystemAppData\wsg, the latter being the seemingly actual save file, it just does not use the same naming convention as the steam version so putting save folders in there doesnt do anything
Obsidian, can we get an import function on the Xbox Games Pass version of the game?