[benaadams]

You go via the Save/Load dialogs which give access to a file; apps just aren't given non-permission/user-interaction file enumeration by default except for certain directories https://msdn.microsoft.com/en-gb/windows/uwp/files/file-acce...

[flukus]

Sounds like it's not possible to create a custom file manager, or space visualizer or anything like that?

[benaadams]

"System Level Access to All User Data" permission?

Though you can't submit to store with request for that permission: https://msdn.microsoft.com/windows/uwp/packaging/app-capabil...

[flukus]

All user data != All file system.