@hobyvh No, the "choose folders" option allows you to decide what OneDrive does and doesn't sync as well as what to keep locally. I wrote that guide while having a OneDrive setup right in front of me, so I could see what happened with each option in real time.
Most applications allow you to install them wherever you want but don't allow you to choose where user data is stored. Some tuck it away inside the program files, so you still effectively get to choose since you've already specified the install location. But for those that don't, it's typical that they dump user data wherever they want without user input. I have yet to install a game from any publisher that allowed me to specify the save location, and I've seen the same from the (relatively few) non-gaming apps I use.
And again, it is a really bad idea to allow users to choose a protected location, for example C:\Windows, to store their data, or a location that stores temp data for that matter. Many players aren't computer-literate enough to understand the purposes of these folders and wouldn't know anything was wrong until they couldn't access their saves.
